/*
  This file is part of TALER
  (C) 2014, 2015, 2016, 2018, 2020, 2021 Taler Systems SA

  TALER is free software; you can redistribute it and/or modify
  it under the terms of the GNU Affero General Public License as
  published by the Free Software Foundation; either version 3,
  or (at your option) any later version.

  TALER is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public
  License along with TALER; see the file COPYING.  If not,
  see <http://www.gnu.org/licenses/>
*/

/**
 * @file taler-merchant-httpd_private-post-orders.c
 * @brief the POST /orders handler
 * @author Christian Grothoff
 * @author Marcello Stanisci
 */
#include "platform.h"
#include <jansson.h>
#include <taler/taler_signatures.h>
#include <taler/taler_json_lib.h>
#include "taler-merchant-httpd_private-post-orders.h"
#include "taler-merchant-httpd_auditors.h"
#include "taler-merchant-httpd_exchanges.h"
#include "taler-merchant-httpd_helper.h"
#include "taler-merchant-httpd_private-get-orders.h"


/**
 * How often do we retry the simple INSERT database transaction?
 */
#define MAX_RETRIES 3

/**
 * What is the label under which we find/place the merchant's
 * jurisdiction in the locations list by default?
 */
#define STANDARD_LABEL_MERCHANT_JURISDICTION "_mj"

/**
 * What is the label under which we find/place the merchant's
 * address in the locations list by default?
 */
#define STANDARD_LABEL_MERCHANT_ADDRESS "_ma"


/**
 * Check that the given JSON array of products is well-formed.
 *
 * @param products JSON array to check
 * @return #GNUNET_OK if all is fine
 */
static enum GNUNET_GenericReturnValue
check_products (const json_t *products)
{
  size_t index;
  json_t *value;

  if (! json_is_array (products))
  {
    GNUNET_break (0);
    return GNUNET_SYSERR;
  }
  json_array_foreach (products, index, value) {
    const char *description;
    const char *error_name;
    unsigned int error_line;
    enum GNUNET_GenericReturnValue res;
    struct GNUNET_JSON_Specification spec[] = {
      // FIXME: parse and format-validate all
      // optional fields of a product and check validity
      GNUNET_JSON_spec_string ("description",
                               &description),
      GNUNET_JSON_spec_end ()
    };

    /* extract fields we need to sign separately */
    res = GNUNET_JSON_parse (value,
                             spec,
                             &error_name,
                             &error_line);
    if (GNUNET_OK != res)
    {
      GNUNET_break (0);
      GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                  "Product parsing failed at #%u: %s:%u\n",
                  (unsigned int) index,
                  error_name,
                  error_line);
      return GNUNET_SYSERR;
    }
    GNUNET_JSON_parse_free (spec);
  }
  return GNUNET_OK;
}


/**
 * Generate the base URL for the given merchant instance.
 *
 * @param connection the MHD connection
 * @param instance_id the merchant instance ID
 * @returns the merchant instance's base URL
 */
static char *
make_merchant_base_url (struct MHD_Connection *connection,
                        const char *instance_id)
{
  const char *host;
  const char *forwarded_host;
  const char *uri_path;
  struct GNUNET_Buffer buf = { 0 };

  if (GNUNET_YES == TALER_mhd_is_https (connection))
    GNUNET_buffer_write_str (&buf, "https://");
  else
    GNUNET_buffer_write_str (&buf, "http://");
  host = MHD_lookup_connection_value (connection,
                                      MHD_HEADER_KIND,
                                      MHD_HTTP_HEADER_HOST);
  forwarded_host = MHD_lookup_connection_value (connection,
                                                MHD_HEADER_KIND,
                                                "X-Forwarded-Host");
  if (NULL != forwarded_host)
  {
    GNUNET_buffer_write_str (&buf,
                             forwarded_host);
  }
  else
  {
    GNUNET_assert (NULL != host);
    GNUNET_buffer_write_str (&buf,
                             host);
  }
  uri_path = MHD_lookup_connection_value (connection,
                                          MHD_HEADER_KIND,
                                          "X-Forwarded-Prefix");
  if (NULL != uri_path)
  {
    /* Currently the merchant backend is only supported at the root of the path,
       this might change in the future.  */
    GNUNET_assert (0);
  }
  if (0 != strcmp (instance_id,
                   "default"))
  {
    GNUNET_buffer_write_path (&buf,
                              "/instances/");
    GNUNET_buffer_write_str (&buf,
                             instance_id);
  }
  GNUNET_buffer_write_path (&buf,
                            "");
  return GNUNET_buffer_reap_str (&buf);
}


/**
 * Information about a product we are supposed to add to the order
 * based on what we know it from our inventory.
 */
struct InventoryProduct
{
  /**
   * Identifier of the product in the inventory.
   */
  const char *product_id;

  /**
   * Number of units of the product to add to the order.
   */
  uint32_t quantity;
};


/**
 * Execute the database transaction to setup the order.
 *
 * @param hc handler context for the request
 * @param order_id unique ID for the order
 * @param h_post_data hash of the client's POST request, for idempotency checks
 * @param pay_deadline until when does the order have to be paid
 * @param[in] order order to process (not modified)
 * @param claim_token token to use for access control
 * @param inventory_products_length length of the @a inventory_products array
 * @param inventory_products array of products to add to @a order from our inventory
 * @param uuids_length length of the @a uuids array
 * @param uuids array of UUIDs used to reserve products from @a inventory_products
 * @param[out] out_of_stock_index which product (by offset) is out of stock, UINT_MAX if all were in-stock
 * @return transaction status, 0 if @a uuids were insufficient to reserve required inventory
 */
static enum GNUNET_DB_QueryStatus
execute_transaction (struct TMH_HandlerContext *hc,
                     const char *order_id,
                     const struct GNUNET_HashCode *h_post_data,
                     struct GNUNET_TIME_Absolute pay_deadline,
                     const json_t *order,
                     const struct TALER_ClaimTokenP *claim_token,
                     unsigned int inventory_products_length,
                     const struct InventoryProduct inventory_products[],
                     unsigned int uuids_length,
                     const struct GNUNET_Uuid uuids[],
                     unsigned int *out_of_stock_index)
{
  enum GNUNET_DB_QueryStatus qs;
  struct GNUNET_TIME_Absolute timestamp;
  uint64_t order_serial;

  if (GNUNET_OK !=
      TMH_db->start (TMH_db->cls,
                     "insert_order"))
  {
    GNUNET_break (0);
    return GNUNET_DB_STATUS_HARD_ERROR;
  }
  /* Setup order */
  qs = TMH_db->insert_order (TMH_db->cls,
                             hc->instance->settings.id,
                             order_id,
                             h_post_data,
                             pay_deadline,
                             claim_token,
                             order);
  if (qs <= 0)
  {
    /* qs == 0: probably instance does not exist (anymore) */
    TMH_db->rollback (TMH_db->cls);
    return qs;
  }
  /* Migrate locks from UUIDs to new order: first release old locks */
  for (unsigned int i = 0; i<uuids_length; i++)
  {
    qs = TMH_db->unlock_inventory (TMH_db->cls,
                                   &uuids[i]);
    if (qs < 0)
    {
      TMH_db->rollback (TMH_db->cls);
      return qs;
    }
    /* qs == 0 is OK here, that just means we did not HAVE any lock under this
       UUID */
  }
  /* Migrate locks from UUIDs to new order: acquire new locks
     (note: this can basically ONLY fail on serializability OR
     because the UUID locks were insufficient for the desired
     quantities). */
  for (unsigned int i = 0; i<inventory_products_length; i++)
  {
    qs = TMH_db->insert_order_lock (TMH_db->cls,
                                    hc->instance->settings.id,
                                    order_id,
                                    inventory_products[i].product_id,
                                    inventory_products[i].quantity);
    if (qs < 0)
    {
      TMH_db->rollback (TMH_db->cls);
      return qs;
    }
    if (GNUNET_DB_STATUS_SUCCESS_NO_RESULTS == qs)
    {
      /* qs == 0: lock acquisition failed due to insufficient stocks */
      TMH_db->rollback (TMH_db->cls);
      *out_of_stock_index = i; /* indicate which product is causing the issue */
      return GNUNET_DB_STATUS_SUCCESS_ONE_RESULT;
    }
  }
  *out_of_stock_index = UINT_MAX;

  /* Get the order serial and timestamp for the order we just created to
     update long-poll clients. */
  qs = TMH_db->lookup_order_summary (TMH_db->cls,
                                     hc->instance->settings.id,
                                     order_id,
                                     &timestamp,
                                     &order_serial);
  if (GNUNET_DB_STATUS_SUCCESS_ONE_RESULT != qs)
  {
    TMH_db->rollback (TMH_db->cls);
    return qs;
  }
  /* finally, commit transaction (note: if it fails, we ALSO re-acquire
     the UUID locks, which is exactly what we want) */
  qs = TMH_db->commit (TMH_db->cls);
  if (0 > qs)
    return qs;
  return GNUNET_DB_STATUS_SUCCESS_ONE_RESULT;   /* 1 == success! */
}


/**
 * Transform an order into a proposal and store it in the
 * database. Write the resulting proposal or an error message
 * of a MHD connection.
 *
 * @param connection connection to write the result or error to
 * @param hc handler context for the request
 * @param h_post_data hash of the client's POST request, for idempotency checks
 * @param[in,out] order order to process (can be modified)
 * @param claim_token token to use for access control
 * @param inventory_products_length length of the @a inventory_products array
 * @param inventory_products array of products to add to @a order from our inventory
 * @param uuids_length length of the @a uuids array
 * @param uuids array of UUIDs used to reserve products from @a inventory_products
 * @return MHD result code
 */
static MHD_RESULT
execute_order (struct MHD_Connection *connection,
               struct TMH_HandlerContext *hc,
               const struct GNUNET_HashCode *h_post_data,
               json_t *order,
               const struct TALER_ClaimTokenP *claim_token,
               unsigned int inventory_products_length,
               const struct InventoryProduct inventory_products[],
               unsigned int uuids_length,
               const struct GNUNET_Uuid uuids[])
{
  const struct TALER_MERCHANTDB_InstanceSettings *settings =
    &hc->instance->settings;
  struct TALER_Amount total;
  const char *order_id;
  const char *summary;
  json_t *products;
  json_t *merchant;
  struct GNUNET_TIME_Absolute timestamp;
  struct GNUNET_TIME_Absolute refund_deadline;
  struct GNUNET_TIME_Absolute wire_transfer_deadline;
  struct GNUNET_TIME_Absolute pay_deadline;
  struct GNUNET_JSON_Specification spec[] = {
    TALER_JSON_spec_amount ("amount",
                            TMH_currency,
                            &total),
    GNUNET_JSON_spec_string ("order_id",
                             &order_id),
    GNUNET_JSON_spec_string ("summary",
                             &summary),
    /**
     * The following entries we don't actually need,
     * except to check that the order is well-formed */
    GNUNET_JSON_spec_json ("products",
                           &products),
    GNUNET_JSON_spec_json ("merchant",
                           &merchant),
    TALER_JSON_spec_absolute_time ("timestamp",
                                   &timestamp),
    TALER_JSON_spec_absolute_time ("refund_deadline",
                                   &refund_deadline),
    TALER_JSON_spec_absolute_time ("pay_deadline",
                                   &pay_deadline),
    TALER_JSON_spec_absolute_time ("wire_transfer_deadline",
                                   &wire_transfer_deadline),
    GNUNET_JSON_spec_end ()
  };
  enum GNUNET_DB_QueryStatus qs;
  unsigned int out_of_stock_index;

  /* extract fields we need to sign separately */
  {
    enum GNUNET_GenericReturnValue res;

    res = TALER_MHD_parse_json_data (connection,
                                     order,
                                     spec);
    if (GNUNET_OK != res)
    {
      GNUNET_break_op (0);
      return (GNUNET_NO == res)
             ? MHD_YES
             : MHD_NO;
    }
  }

  /* check product list in contract is well-formed */
  if (GNUNET_OK != check_products (products))
  {
    GNUNET_JSON_parse_free (spec);
    return TALER_MHD_reply_with_error (connection,
                                       MHD_HTTP_BAD_REQUEST,
                                       TALER_EC_GENERIC_PARAMETER_MALFORMED,
                                       "order:products");
  }

  /* Test if we already have an order with this id */
  {
    struct TALER_ClaimTokenP token;
    json_t *contract_terms;
    struct GNUNET_HashCode orig_post;

    TMH_db->preflight (TMH_db->cls);
    qs = TMH_db->lookup_order (TMH_db->cls,
                               hc->instance->settings.id,
                               order_id,
                               &token,
                               &orig_post,
                               &contract_terms);
    /* If yes, check for idempotency */
    if (0 > qs)
    {
      GNUNET_break (0);
      TMH_db->rollback (TMH_db->cls);
      GNUNET_JSON_parse_free (spec);
      return TALER_MHD_reply_with_error (connection,
                                         MHD_HTTP_INTERNAL_SERVER_ERROR,
                                         TALER_EC_GENERIC_DB_FETCH_FAILED,
                                         "lookup_order");
    }
    if (GNUNET_DB_STATUS_SUCCESS_ONE_RESULT == qs)
    {
      MHD_RESULT ret;

      json_decref (contract_terms);
      /* Comparing the contract terms is sufficient because all the other
         params get added to it at some point. */
      if (0 == GNUNET_memcmp (&orig_post,
                              h_post_data))
      {
        ret = TALER_MHD_REPLY_JSON_PACK (
          connection,
          MHD_HTTP_OK,
          GNUNET_JSON_pack_string ("order_id",
                                   order_id),
          GNUNET_JSON_pack_allow_null (
            GNUNET_JSON_pack_data_varsize (
              "token",
              GNUNET_is_zero (&token)
              ? NULL
              : &token,
              sizeof (token))));
      }
      else
      {
        /* This request is not idempotent */
        ret = TALER_MHD_reply_with_error (
          connection,
          MHD_HTTP_CONFLICT,
          TALER_EC_MERCHANT_PRIVATE_POST_ORDERS_ALREADY_EXISTS,
          order_id);
      }
      GNUNET_JSON_parse_free (spec);
      return ret;
    }
  }
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Executing database transaction to create order '%s' for instance '%s'\n",
              order_id,
              settings->id);
  for (unsigned int i = 0; i<MAX_RETRIES; i++)
  {
    TMH_db->preflight (TMH_db->cls);
    qs = execute_transaction (hc,
                              order_id,
                              h_post_data,
                              pay_deadline,
                              order,
                              claim_token,
                              inventory_products_length,
                              inventory_products,
                              uuids_length,
                              uuids,
                              &out_of_stock_index);
    if (GNUNET_DB_STATUS_SOFT_ERROR != qs)
      break;
  }
  if (0 >= qs)
  {
    GNUNET_JSON_parse_free (spec);
    /* Special report if retries insufficient */
    if (GNUNET_DB_STATUS_SOFT_ERROR == qs)
    {
      GNUNET_break (0);
      return TALER_MHD_reply_with_error (connection,
                                         MHD_HTTP_INTERNAL_SERVER_ERROR,
                                         TALER_EC_GENERIC_DB_SOFT_FAILURE,
                                         NULL);
    }
    if (GNUNET_DB_STATUS_SUCCESS_NO_RESULTS == qs)
    {
      /* should be: contract (!) with same order ID
         already exists */
      return TALER_MHD_reply_with_error (
        connection,
        MHD_HTTP_CONFLICT,
        TALER_EC_MERCHANT_PRIVATE_POST_ORDERS_ALREADY_EXISTS,
        order_id);
    }
    /* Other hard transaction error (disk full, etc.) */
    GNUNET_break (0);
    return TALER_MHD_reply_with_error (
      connection,
      MHD_HTTP_INTERNAL_SERVER_ERROR,
      TALER_EC_GENERIC_DB_COMMIT_FAILED,
      NULL);
  }

  /* DB transaction succeeded, check for out-of-stock */
  if (out_of_stock_index < UINT_MAX)
  {
    /* We had a product that has insufficient quantities,
       generate the details for the response. */
    struct TALER_MERCHANTDB_ProductDetails pd;
    MHD_RESULT ret;

    memset (&pd, 0, sizeof (pd));
    qs = TMH_db->lookup_product (
      TMH_db->cls,
      hc->instance->settings.id,
      inventory_products[out_of_stock_index].product_id,
      &pd);
    GNUNET_JSON_parse_free (spec);
    switch (qs)
    {
    case GNUNET_DB_STATUS_SUCCESS_ONE_RESULT:
      ret = TALER_MHD_REPLY_JSON_PACK (
        connection,
        MHD_HTTP_GONE,
        GNUNET_JSON_pack_string (
          "product_id",
          inventory_products[out_of_stock_index].product_id),
        GNUNET_JSON_pack_uint64 (
          "requested_quantity",
          inventory_products[out_of_stock_index].quantity),
        GNUNET_JSON_pack_uint64 (
          "available_quantity",
          pd.total_stock - pd.total_sold - pd.total_lost),
        GNUNET_JSON_pack_allow_null (
          GNUNET_JSON_pack_time_abs (
            "restock_expected",
            pd.next_restock)));
      TALER_MERCHANTDB_product_details_free (&pd);
      return ret;
    case GNUNET_DB_STATUS_SUCCESS_NO_RESULTS:
      return TALER_MHD_REPLY_JSON_PACK (
        connection,
        MHD_HTTP_GONE,
        GNUNET_JSON_pack_string (
          "product_id",
          inventory_products[out_of_stock_index].product_id),
        GNUNET_JSON_pack_uint64 (
          "requested_quantity",
          inventory_products[out_of_stock_index].quantity),
        GNUNET_JSON_pack_uint64 (
          "available_quantity",
          0));
    case GNUNET_DB_STATUS_SOFT_ERROR:
      GNUNET_break (0);
      return TALER_MHD_reply_with_error (
        connection,
        MHD_HTTP_INTERNAL_SERVER_ERROR,
        TALER_EC_GENERIC_DB_SOFT_FAILURE,
        NULL);
    case GNUNET_DB_STATUS_HARD_ERROR:
      return TALER_MHD_reply_with_error (
        connection,
        MHD_HTTP_INTERNAL_SERVER_ERROR,
        TALER_EC_GENERIC_DB_FETCH_FAILED,
        NULL);
    }
    GNUNET_break (0);
    return MHD_NO;
  }

  /* Everything in-stock, generate positive response */
  {
    MHD_RESULT ret;

    ret = TALER_MHD_REPLY_JSON_PACK (
      connection,
      MHD_HTTP_OK,
      GNUNET_JSON_pack_string ("order_id",
                               order_id),
      GNUNET_JSON_pack_allow_null (
        GNUNET_JSON_pack_data_varsize (
          "token",
          GNUNET_is_zero (claim_token)
          ? NULL
          : claim_token,
          sizeof (*claim_token))));
    GNUNET_JSON_parse_free (spec);
    return ret;
  }
}


/**
 * Add missing fields to the order.  Upon success, continue
 * processing with execute_order().
 *
 * @param connection connection to write the result or error to
 * @param hc handler context for the request
 * @param h_post_data hash of the client's POST request, for idempotency checks
 * @param[in,out] order order to process (can be modified)
 * @param claim_token token to use for access control
 * @param refund_delay refund delay
 * @param inventory_products_length length of the @a inventory_products array
 * @param inventory_products array of products to add to @a order from our inventory
 * @param uuids_length length of the @a uuids array
 * @param uuids array of UUIDs used to reserve products from @a inventory_products
 * @return MHD result code
 */
static MHD_RESULT
patch_order (struct MHD_Connection *connection,
             struct TMH_HandlerContext *hc,
             const struct GNUNET_HashCode *h_post_data,
             json_t *order,
             const struct TALER_ClaimTokenP *claim_token,
             struct GNUNET_TIME_Relative refund_delay,
             unsigned int inventory_products_length,
             const struct InventoryProduct inventory_products[],
             unsigned int uuids_length,
             const struct GNUNET_Uuid uuids[])
{
  const struct TALER_MERCHANTDB_InstanceSettings *settings =
    &hc->instance->settings;
  const char *order_id = NULL;
  const char *fulfillment_url = NULL;
  const char *merchant_base_url = NULL;
  json_t *jmerchant = NULL;
  json_t *delivery_location = NULL;
  struct TALER_Amount max_wire_fee = { 0 };
  struct TALER_Amount max_fee = { 0 };
  uint32_t wire_fee_amortization = 0;
  struct GNUNET_TIME_Absolute timestamp = { 0 };
  struct GNUNET_TIME_Absolute delivery_date = { 0 };
  struct GNUNET_TIME_Absolute refund_deadline
    = GNUNET_TIME_UNIT_FOREVER_ABS;
  struct GNUNET_TIME_Absolute pay_deadline = { 0 };
  struct GNUNET_TIME_Absolute wire_deadline
    = GNUNET_TIME_UNIT_FOREVER_ABS;
  /* auto_refund only needs to be type-checked,
   * mostly because in GNUnet relative times can't
   * be negative.  */
  struct GNUNET_TIME_Relative auto_refund;
  struct GNUNET_JSON_Specification spec[] = {
    GNUNET_JSON_spec_mark_optional (
      GNUNET_JSON_spec_string ("merchant_base_url",
                               &merchant_base_url)),
    GNUNET_JSON_spec_mark_optional (
      GNUNET_JSON_spec_json ("merchant",
                             &jmerchant)),
    GNUNET_JSON_spec_mark_optional (
      GNUNET_JSON_spec_string ("order_id",
                               &order_id)),
    GNUNET_JSON_spec_mark_optional (
      GNUNET_JSON_spec_string ("fulfillment_url",
                               &fulfillment_url)),
    GNUNET_JSON_spec_mark_optional (
      TALER_JSON_spec_absolute_time ("timestamp",
                                     &timestamp)),
    GNUNET_JSON_spec_mark_optional (
      TALER_JSON_spec_absolute_time ("refund_deadline",
                                     &refund_deadline)),
    GNUNET_JSON_spec_mark_optional (
      TALER_JSON_spec_absolute_time ("pay_deadline",
                                     &pay_deadline)),
    GNUNET_JSON_spec_mark_optional (
      TALER_JSON_spec_absolute_time ("wire_transfer_deadline",
                                     &wire_deadline)),
    GNUNET_JSON_spec_mark_optional (
      TALER_JSON_spec_amount ("max_fee",
                              TMH_currency,
                              &max_fee)),
    GNUNET_JSON_spec_mark_optional (
      TALER_JSON_spec_amount ("max_wire_fee",
                              TMH_currency,
                              &max_wire_fee)),
    GNUNET_JSON_spec_mark_optional (
      GNUNET_JSON_spec_uint32 ("wire_fee_amortization",
                               &wire_fee_amortization)),
    GNUNET_JSON_spec_mark_optional (
      TALER_JSON_spec_absolute_time ("delivery_date",
                                     &delivery_date)),
    GNUNET_JSON_spec_mark_optional (
      TALER_JSON_spec_relative_time ("auto_refund",
                                     &auto_refund)),
    GNUNET_JSON_spec_mark_optional (
      GNUNET_JSON_spec_json ("delivery_location",
                             &delivery_location)),

    GNUNET_JSON_spec_end ()
  };
  enum GNUNET_GenericReturnValue ret;

  ret = TALER_MHD_parse_json_data (connection,
                                   order,
                                   spec);
  if (GNUNET_OK != ret)
  {
    GNUNET_break_op (0);
    return (GNUNET_NO == ret)
           ? MHD_YES
           : MHD_NO;
  }

  /* Add order_id if it doesn't exist. */
  if (NULL == order_id)
  {
    char buf[256];
    time_t timer;
    struct tm *tm_info;
    size_t off;
    uint64_t rand;
    char *last;
    json_t *jbuf;

    time (&timer);
    tm_info = localtime (&timer);
    if (NULL == tm_info)
    {
      return TALER_MHD_reply_with_error (
        connection,
        MHD_HTTP_INTERNAL_SERVER_ERROR,
        TALER_EC_MERCHANT_PRIVATE_POST_ORDERS_NO_LOCALTIME,
        NULL);
    }
    off = strftime (buf,
                    sizeof (buf) - 1,
                    "%Y.%j",
                    tm_info);
    /* Check for error state of strftime */
    GNUNET_assert (0 != off);
    buf[off++] = '-';
    rand = GNUNET_CRYPTO_random_u64 (GNUNET_CRYPTO_QUALITY_WEAK,
                                     UINT64_MAX);
    last = GNUNET_STRINGS_data_to_string (&rand,
                                          sizeof (uint64_t),
                                          &buf[off],
                                          sizeof (buf) - off);
    GNUNET_assert (NULL != last);
    *last = '\0';
    jbuf = json_string (buf);
    GNUNET_assert (NULL != jbuf);
    GNUNET_log (GNUNET_ERROR_TYPE_INFO,
                "Assigning order ID `%s' server-side\n",
                buf);
    GNUNET_break (0 ==
                  json_object_set_new (order,
                                       "order_id",
                                       jbuf));
    order_id = json_string_value (jbuf);
    GNUNET_assert (NULL != order_id);
  }

  /* Patch fulfillment URL with order_id (implements #6467). */
  if (NULL != fulfillment_url)
  {
    const char *pos;

    pos = strstr (fulfillment_url,
                  "${ORDER_ID}");
    if (NULL != pos)
    {
      /* replace ${ORDER_ID} with the real order_id */
      char *nurl;

      /* We only allow one placeholder */
      if (strstr (pos + strlen ("${ORDER_ID}"),
                  "${ORDER_ID}"))
      {
        /* FIXME: free anything? */
        GNUNET_break_op (0);
        return TALER_MHD_reply_with_error (connection,
                                           MHD_HTTP_BAD_REQUEST,
                                           TALER_EC_GENERIC_PARAMETER_MALFORMED,
                                           "fulfillment_url");
      }

      GNUNET_asprintf (&nurl,
                       "%.*s%s%s",
                       /* first output URL until ${ORDER_ID} */
                       (int) (pos - fulfillment_url),
                       fulfillment_url,
                       /* replace ${ORDER_ID} with the right order_id */
                       order_id,
                       /* append rest of original URL */
                       pos + strlen ("${ORDER_ID}"));
      /* replace in JSON of the order */
      GNUNET_break (0 ==
                    json_object_set_new (order,
                                         "fulfillment_url",
                                         json_string (nurl)));
      GNUNET_free (nurl);
    }
  }

  /* Check soundness of refund deadline, and that a timestamp
   * is actually present.  */
  {
    struct GNUNET_TIME_Absolute now = GNUNET_TIME_absolute_get ();

    (void) GNUNET_TIME_round_abs (&now);
    /* Add timestamp if it doesn't exist (or is zero) */
    if (0 == timestamp.abs_value_us)
    {
      GNUNET_assert (0 ==
                     json_object_set_new (order,
                                          "timestamp",
                                          GNUNET_JSON_from_time_abs (now)));
    }

    /* If no refund_deadline given, set one based on refund_delay.  */
    if (GNUNET_TIME_UNIT_FOREVER_ABS.abs_value_us ==
        refund_deadline.abs_value_us)
    {
      if (0 == refund_delay.rel_value_us)
      {
        GNUNET_log (GNUNET_ERROR_TYPE_INFO,
                    "Refund delay is zero, no refunds are possible for this order\n");
        refund_deadline = now; /* if delay was 0, ensure that refund_deadline == timestamp */
      }
      else
      {
        refund_deadline = GNUNET_TIME_relative_to_absolute (refund_delay);
        (void) GNUNET_TIME_round_abs (&refund_deadline);
      }

      GNUNET_assert (0 ==
                     json_object_set_new (order,
                                          "refund_deadline",
                                          GNUNET_JSON_from_time_abs (
                                            refund_deadline)));
    }
    if ((0 != delivery_date.abs_value_us) &&
        (delivery_date.abs_value_us < now.abs_value_us) )
    {
      GNUNET_break_op (0);
      return TALER_MHD_reply_with_error (
        connection,
        MHD_HTTP_BAD_REQUEST,
        TALER_EC_MERCHANT_PRIVATE_POST_ORDERS_DELIVERY_DATE_IN_PAST,
        NULL);
    }
  }

  if (0 == pay_deadline.abs_value_us)
  {
    struct GNUNET_TIME_Absolute t;

    t = GNUNET_TIME_relative_to_absolute (settings->default_pay_delay);
    (void) GNUNET_TIME_round_abs (&t);
    GNUNET_assert (0 ==
                   json_object_set_new (order,
                                        "pay_deadline",
                                        GNUNET_JSON_from_time_abs (t)));
  }

  if (GNUNET_TIME_UNIT_FOREVER_ABS.abs_value_us == wire_deadline.abs_value_us)
  {
    struct GNUNET_TIME_Absolute t;

    t = GNUNET_TIME_relative_to_absolute (
      GNUNET_TIME_relative_max (settings->default_wire_transfer_delay,
                                refund_delay));
    wire_deadline = GNUNET_TIME_absolute_max (refund_deadline,
                                              t);
    (void) GNUNET_TIME_round_abs (&wire_deadline);
    GNUNET_assert (0 ==
                   json_object_set_new (order,
                                        "wire_transfer_deadline",
                                        GNUNET_JSON_from_time_abs (
                                          wire_deadline)));
  }
  if (wire_deadline.abs_value_us < refund_deadline.abs_value_us)
  {
    GNUNET_break_op (0);
    return TALER_MHD_reply_with_error (
      connection,
      MHD_HTTP_BAD_REQUEST,
      TALER_EC_MERCHANT_PRIVATE_POST_ORDERS_REFUND_AFTER_WIRE_DEADLINE,
      "order:wire_transfer_deadline;order:refund_deadline");

  }

  /* Note: total amount currency match checked
     later in execute_order() */
  if (GNUNET_OK !=
      TALER_amount_is_valid (&max_wire_fee))
  {
    GNUNET_assert (0 ==
                   json_object_set_new (
                     order,
                     "max_wire_fee",
                     TALER_JSON_from_amount (&settings->default_max_wire_fee)));
  }

  if (GNUNET_OK !=
      TALER_amount_is_valid (&max_fee))
  {
    GNUNET_assert (0 ==
                   json_object_set_new (
                     order,
                     "max_fee",
                     TALER_JSON_from_amount
                       (&settings->default_max_deposit_fee)));
  }
  if (0 == wire_fee_amortization)
  {
    GNUNET_assert (0 ==
                   json_object_set_new (
                     order,
                     "wire_fee_amortization",
                     json_integer (
                       (json_int_t) settings->default_wire_fee_amortization)));
  }
  if (NULL == merchant_base_url)
  {
    char *url;

    url = make_merchant_base_url (connection,
                                  settings->id);
    GNUNET_assert (0 ==
                   json_object_set_new (order,
                                        "merchant_base_url",
                                        json_string (url)));
    GNUNET_free (url);
  }
  else if (('\0' == *merchant_base_url) ||
           ('/' != merchant_base_url[strlen (merchant_base_url) - 1]))
  {
    GNUNET_break_op (0);
    return TALER_MHD_reply_with_error (
      connection,
      MHD_HTTP_BAD_REQUEST,
      TALER_EC_MERCHANT_PRIVATE_POST_ORDERS_PROPOSAL_PARSE_ERROR,
      "merchant_base_url is not valid");
  }

  /* Fill in merchant information if necessary */
  if (NULL != jmerchant)
  {
    GNUNET_break_op (0);
    return TALER_MHD_reply_with_error (
      connection,
      MHD_HTTP_BAD_REQUEST,
      TALER_EC_MERCHANT_PRIVATE_POST_ORDERS_PROPOSAL_PARSE_ERROR,
      "'merchant' field already set, but must be provided by backend");
  }
  jmerchant = GNUNET_JSON_PACK (
    GNUNET_JSON_pack_string ("name",
                             settings->name));
  GNUNET_assert (NULL != jmerchant);
  {
    json_t *loca;

    /* Handle merchant address */
    loca = settings->address;
    if (NULL != loca)
    {
      loca = json_deep_copy (loca);
      GNUNET_assert (0 ==
                     json_object_set_new (jmerchant,
                                          "address",
                                          loca));
    }
  }
  {
    json_t *locj;

    /* Handle merchant jurisdiction */
    locj = settings->jurisdiction;
    if (NULL != locj)
    {
      locj = json_deep_copy (locj);
      GNUNET_assert (0 ==
                     json_object_set_new (jmerchant,
                                          "jurisdiction",
                                          locj));
    }
  }
  GNUNET_assert (0 ==
                 json_object_set_new (order,
                                      "merchant",
                                      jmerchant));

  /* add fields to the contract that the backend should provide */
  GNUNET_assert (0 ==
                 json_object_set (order,
                                  "exchanges",
                                  TMH_trusted_exchanges));
  GNUNET_assert (0 ==
                 json_object_set (order,
                                  "auditors",
                                  j_auditors));
  GNUNET_assert (0 ==
                 json_object_set_new (order,
                                      "merchant_pub",
                                      GNUNET_JSON_from_data_auto (
                                        &hc->instance->merchant_pub)));
  if (GNUNET_OK !=
      TALER_JSON_contract_seed_forgettable (order))
  {
    return TALER_MHD_reply_with_error (
      connection,
      MHD_HTTP_BAD_REQUEST,
      TALER_EC_GENERIC_JSON_INVALID,
      "could not compute hash of order due to bogus forgettable fields");
  }

  if ( (NULL != delivery_location) &&
       (! TMH_location_object_valid (delivery_location)) )
  {
    GNUNET_break_op (0);
    GNUNET_JSON_parse_free (spec);
    return TALER_MHD_reply_with_error (connection,
                                       MHD_HTTP_BAD_REQUEST,
                                       TALER_EC_GENERIC_PARAMETER_MALFORMED,
                                       "delivery_location");
  }

  /* sanity check result */
  {
    struct GNUNET_HashCode h_control;

    switch (TALER_JSON_contract_hash (order,
                                      &h_control))
    {
    case GNUNET_SYSERR:
      GNUNET_break (0);
      return TALER_MHD_reply_with_error (
        connection,
        MHD_HTTP_INTERNAL_SERVER_ERROR,
        TALER_EC_GENERIC_FAILED_COMPUTE_JSON_HASH,
        "could not compute hash of patched order");
    case GNUNET_NO:
      GNUNET_break_op (0);
      return TALER_MHD_reply_with_error (
        connection,
        MHD_HTTP_BAD_REQUEST,
        TALER_EC_GENERIC_FAILED_COMPUTE_JSON_HASH,
        "order contained unallowed values");
    case GNUNET_OK:
      break;
    }
  }
  return execute_order (connection,
                        hc,
                        h_post_data,
                        order,
                        claim_token,
                        inventory_products_length,
                        inventory_products,
                        uuids_length,
                        uuids);
}


/**
 * Process the @a payment_target and add the details of how the
 * order could be paid to @a order. On success, continue
 * processing with patch_order().
 *
 * @param connection connection to write the result or error to
 * @param hc handler context for the request
 * @param h_post_data hash of the client's POST request, for idempotency checks
 * @param[in,out] order order to process (can be modified)
 * @param claim_token token to use for access control
 * @param refund_delay refund delay
 * @param payment_target desired wire method, NULL for no preference
 * @param inventory_products_length length of the @a inventory_products array
 * @param inventory_products array of products to add to @a order from our inventory
 * @param uuids_length length of the @a uuids array
 * @param uuids array of UUIDs used to reserve products from @a inventory_products
 * @return MHD result code
 */
static MHD_RESULT
add_payment_details (struct MHD_Connection *connection,
                     struct TMH_HandlerContext *hc,
                     const struct GNUNET_HashCode *h_post_data,
                     json_t *order,
                     const struct TALER_ClaimTokenP *claim_token,
                     struct GNUNET_TIME_Relative refund_delay,
                     const char *payment_target,
                     unsigned int inventory_products_length,
                     const struct InventoryProduct inventory_products[],
                     unsigned int uuids_length,
                     const struct GNUNET_Uuid uuids[])
{
  struct TMH_WireMethod *wm;

  wm = hc->instance->wm_head;
  /* Locate wire method that has a matching payment target */
  while ( (NULL != wm) &&
          ( (! wm->active) ||
            ( (NULL != payment_target) &&
              (0 != strcasecmp (payment_target,
                                wm->wire_method) ) ) ) )
    wm = wm->next;
  if (NULL == wm)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
                "No wire method available for instance '%s'\n",
                hc->instance->settings.id);
    return TALER_MHD_reply_with_error (connection,
                                       MHD_HTTP_NOT_FOUND,
                                       TALER_EC_MERCHANT_PRIVATE_POST_ORDERS_INSTANCE_CONFIGURATION_LACKS_WIRE,
                                       payment_target);
  }
  GNUNET_assert (0 ==
                 json_object_set_new (order,
                                      "h_wire",
                                      GNUNET_JSON_from_data_auto (
                                        &wm->h_wire)));
  GNUNET_assert (0 ==
                 json_object_set_new (order,
                                      "wire_method",
                                      json_string (wm->wire_method)));
  return patch_order (connection,
                      hc,
                      h_post_data,
                      order,
                      claim_token,
                      refund_delay,
                      inventory_products_length,
                      inventory_products,
                      uuids_length,
                      uuids);
}


/**
 * Merge the inventory products into @a order, querying the
 * database about the details of those products. Upon success,
 * continue processing by calling add_payment_details().
 *
 * @param connection connection to write the result or error to
 * @param hc handler context for the request
 * @param h_post_data hash of the client's POST request, for idempotency checks
 * @param[in,out] order order to process (can be modified)
 * @param claim_token token to use for access control
 * @param refund_delay time window where it is possible to ask a refund
 * @param payment_target RFC8905 payment target type to find a matching merchant account
 * @param inventory_products_length length of the @a inventory_products array
 * @param inventory_products array of products to add to @a order from our inventory
 * @param uuids_length length of the @a uuids array
 * @param uuids array of UUIDs used to reserve products from @a inventory_products
 * @return MHD result code
 */
static MHD_RESULT
merge_inventory (struct MHD_Connection *connection,
                 struct TMH_HandlerContext *hc,
                 const struct GNUNET_HashCode *h_post_data,
                 json_t *order,
                 const struct TALER_ClaimTokenP *claim_token,
                 struct GNUNET_TIME_Relative refund_delay,
                 const char *payment_target,
                 unsigned int inventory_products_length,
                 const struct InventoryProduct inventory_products[],
                 unsigned int uuids_length,
                 const struct GNUNET_Uuid uuids[])
{
  /**
   * inventory_products => instructions to add products to contract terms
   * order.products => contains products that are not from the backend-managed inventory.
   */
  GNUNET_assert (NULL != order);
  {
    json_t *jprod = json_object_get (order,
                                     "products");
    if (NULL == jprod)
    {
      GNUNET_assert (0 ==
                     json_object_set_new (order,
                                          "products",
                                          json_array ()));
    }
    else if (! json_is_array (jprod))
    {
      return TALER_MHD_reply_with_error (connection,
                                         MHD_HTTP_BAD_REQUEST,
                                         TALER_EC_GENERIC_PARAMETER_MALFORMED,
                                         "order.products");
    }
  }

  /* Populate products from inventory product array and database */
  {
    json_t *np = json_array ();

    for (unsigned int i = 0; i<inventory_products_length; i++)
    {
      struct TALER_MERCHANTDB_ProductDetails pd;
      enum GNUNET_DB_QueryStatus qs;

      qs = TMH_db->lookup_product (TMH_db->cls,
                                   hc->instance->settings.id,
                                   inventory_products[i].product_id,
                                   &pd);
      if (qs <= 0)
      {
        enum TALER_ErrorCode ec = TALER_EC_GENERIC_INTERNAL_INVARIANT_FAILURE;
        unsigned int http_status = 0;

        switch (qs)
        {
        case GNUNET_DB_STATUS_HARD_ERROR:
          GNUNET_break (0);
          http_status = MHD_HTTP_INTERNAL_SERVER_ERROR;
          ec = TALER_EC_GENERIC_DB_FETCH_FAILED;
          break;
        case GNUNET_DB_STATUS_SOFT_ERROR:
          GNUNET_break (0);
          http_status = MHD_HTTP_INTERNAL_SERVER_ERROR;
          ec = TALER_EC_GENERIC_DB_SOFT_FAILURE;
          break;
        case GNUNET_DB_STATUS_SUCCESS_NO_RESULTS:
          http_status = MHD_HTTP_NOT_FOUND;
          ec = TALER_EC_MERCHANT_GENERIC_PRODUCT_UNKNOWN;
          break;
        case GNUNET_DB_STATUS_SUCCESS_ONE_RESULT:
          /* case listed to make compilers happy */
          GNUNET_assert (0);
        }
        json_decref (np);
        return TALER_MHD_reply_with_error (connection,
                                           http_status,
                                           ec,
                                           inventory_products[i].product_id);
      }
      {
        json_t *p;

        p = GNUNET_JSON_PACK (
          GNUNET_JSON_pack_string ("description",
                                   pd.description),
          GNUNET_JSON_pack_object_steal ("description_i18n",
                                         pd.description_i18n),
          GNUNET_JSON_pack_string ("unit",
                                   pd.unit),
          TALER_JSON_pack_amount ("price",
                                  &pd.price),
          GNUNET_JSON_pack_array_steal ("taxes",
                                        pd.taxes),
          GNUNET_JSON_pack_string ("image",
                                   pd.image),
          GNUNET_JSON_pack_uint64 ("quantity",
                                   inventory_products[i].
                                   quantity));
        GNUNET_assert (NULL != p);
        GNUNET_assert (0 ==
                       json_array_append_new (np,
                                              p));
      }
      GNUNET_free (pd.description);
      GNUNET_free (pd.unit);
      GNUNET_free (pd.image);
      json_decref (pd.address);
    }
    /* merge into existing products list */
    {
      json_t *xp;

      xp = json_object_get (order,
                            "products");
      GNUNET_assert (NULL != xp);
      json_array_extend (xp, np);
      json_decref (np);
    }
  }
  return add_payment_details (connection,
                              hc,
                              h_post_data,
                              order,
                              claim_token,
                              refund_delay,
                              payment_target,
                              inventory_products_length,
                              inventory_products,
                              uuids_length,
                              uuids);
}


/**
 * Generate an order.  We add the fields 'exchanges', 'merchant_pub', and
 * 'H_wire' to the order gotten from the frontend, as well as possibly other
 * fields if the frontend did not provide them. Returns the order_id.
 *
 * @param rh context of the handler
 * @param connection the MHD connection to handle
 * @param[in,out] hc context with further information about the request
 * @return MHD result code
 */
MHD_RESULT
TMH_private_post_orders (const struct TMH_RequestHandler *rh,
                         struct MHD_Connection *connection,
                         struct TMH_HandlerContext *hc)
{
  json_t *order;
  struct GNUNET_TIME_Relative refund_delay = {
    .rel_value_us = 0
  };
  const char *payment_target = NULL;
  json_t *ip = NULL;
  unsigned int ips_len = 0;
  struct InventoryProduct *ips = NULL;
  unsigned int uuids_len = 0;
  json_t *uuid;
  struct GNUNET_Uuid *uuids = NULL;
  struct TALER_ClaimTokenP claim_token;
  bool create_token = true; /* default */
  struct GNUNET_JSON_Specification spec[] = {
    GNUNET_JSON_spec_json ("order",
                           &order),
    GNUNET_JSON_spec_mark_optional (
      TALER_JSON_spec_relative_time ("refund_delay",
                                     &refund_delay)),
    GNUNET_JSON_spec_mark_optional (
      GNUNET_JSON_spec_string ("payment_target",
                               &payment_target)),
    GNUNET_JSON_spec_mark_optional (
      GNUNET_JSON_spec_json ("inventory_products",
                             &ip)),
    GNUNET_JSON_spec_mark_optional (
      GNUNET_JSON_spec_json ("lock_uuids",
                             &uuid)),
    GNUNET_JSON_spec_mark_optional (
      GNUNET_JSON_spec_bool ("create_token",
                             &create_token)),
    GNUNET_JSON_spec_end ()
  };
  enum GNUNET_GenericReturnValue ret;
  struct GNUNET_HashCode h_post_data;

  (void) rh;
  ret = TALER_MHD_parse_json_data (connection,
                                   hc->request_body,
                                   spec);
  if (GNUNET_OK != ret)
    return (GNUNET_NO == ret)
           ? MHD_YES
           : MHD_NO;

  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Refund delay is %s\n",
              GNUNET_STRINGS_relative_time_to_string (refund_delay,
                                                      GNUNET_NO));

  TMH_db->expire_locks (TMH_db->cls);
  if (create_token)
  {
    GNUNET_CRYPTO_random_block (GNUNET_CRYPTO_QUALITY_NONCE,
                                &claim_token,
                                sizeof (claim_token));
  }
  else
  {
    /* we use all-zeros for 'no token' */
    memset (&claim_token,
            0,
            sizeof (claim_token));
  }

  /* Compute h_post_data (for idempotency check) */
  {
    char *req_body_enc;

    /* Dump normalized JSON to string. */
    if (NULL == (req_body_enc = json_dumps (hc->request_body,
                                            JSON_ENCODE_ANY
                                            | JSON_COMPACT
                                            | JSON_SORT_KEYS)))
    {
      GNUNET_break (0);
      GNUNET_JSON_parse_free (spec);
      return TALER_MHD_reply_with_error (connection,
                                         MHD_HTTP_INTERNAL_SERVER_ERROR,
                                         TALER_EC_GENERIC_ALLOCATION_FAILURE,
                                         "request body normalization for hashing");
    }
    GNUNET_CRYPTO_hash (req_body_enc,
                        strlen (req_body_enc),
                        &h_post_data);
    GNUNET_free (req_body_enc);
  }

  /* parse the inventory_products (optionally given) */
  if (NULL != ip)
  {
    if (! json_is_array (ip))
    {
      GNUNET_JSON_parse_free (spec);
      return TALER_MHD_reply_with_error (connection,
                                         MHD_HTTP_BAD_REQUEST,
                                         TALER_EC_GENERIC_PARAMETER_MALFORMED,
                                         "inventory_products");
    }
    GNUNET_array_grow (ips,
                       ips_len,
                       json_array_size (ip));
    for (unsigned int i = 0; i<ips_len; i++)
    {
      const char *error_name;
      unsigned int error_line;
      struct GNUNET_JSON_Specification ispec[] = {
        GNUNET_JSON_spec_string ("product_id",
                                 &ips[i].product_id),
        GNUNET_JSON_spec_uint32 ("quantity",
                                 &ips[i].quantity),
        GNUNET_JSON_spec_end ()
      };

      ret = GNUNET_JSON_parse (json_array_get (ip,
                                               i),
                               ispec,
                               &error_name,
                               &error_line);
      if (GNUNET_OK != ret)
      {
        GNUNET_break_op (0);
        GNUNET_array_grow (ips,
                           ips_len,
                           0);
        GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
                    "Product parsing failed at #%u: %s:%u\n",
                    i,
                    error_name,
                    error_line);
        GNUNET_JSON_parse_free (spec);
        return TALER_MHD_reply_with_error (connection,
                                           MHD_HTTP_BAD_REQUEST,
                                           TALER_EC_GENERIC_PARAMETER_MALFORMED,
                                           "inventory_products");
      }
    }
  }

  /* parse the lock_uuids (optionally given) */
  if (NULL != uuid)
  {
    if (! json_is_array (uuid))
    {
      GNUNET_array_grow (ips,
                         ips_len,
                         0);
      GNUNET_JSON_parse_free (spec);
      return TALER_MHD_reply_with_error (connection,
                                         MHD_HTTP_BAD_REQUEST,
                                         TALER_EC_GENERIC_PARAMETER_MALFORMED,
                                         "lock_uuids");
    }
    GNUNET_array_grow (uuids,
                       uuids_len,
                       json_array_size (uuid));
    for (unsigned int i = 0; i<uuids_len; i++)
    {
      const char *error_name;
      unsigned int error_line;
      const char *uuidsi;
      struct GNUNET_JSON_Specification ispec[] = {
        GNUNET_JSON_spec_string ("uuid",
                                 &uuidsi),
        GNUNET_JSON_spec_end ()
      };

      ret = GNUNET_JSON_parse (json_array_get (uuid,
                                               i),
                               ispec,
                               &error_name,
                               &error_line);
      if (GNUNET_OK != ret)
      {
        GNUNET_break_op (0);
        GNUNET_array_grow (ips,
                           ips_len,
                           0);
        GNUNET_array_grow (uuids,
                           uuids_len,
                           0);
        GNUNET_JSON_parse_free (spec);
        GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
                    "UUID parsing failed at #%u: %s:%u\n",
                    i,
                    error_name,
                    error_line);
        return TALER_MHD_reply_with_error (connection,
                                           MHD_HTTP_BAD_REQUEST,
                                           TALER_EC_GENERIC_PARAMETER_MALFORMED,
                                           "lock_uuids");
      }
      TMH_uuid_from_string (uuidsi,
                            &uuids[i]);
    }
  }

  /* Finally, start by completing the order */
  {
    MHD_RESULT res;

    res = merge_inventory (connection,
                           hc,
                           &h_post_data,
                           order,
                           &claim_token,
                           refund_delay,
                           payment_target,
                           ips_len,
                           ips,
                           uuids_len,
                           uuids);
    GNUNET_array_grow (ips,
                       ips_len,
                       0);
    GNUNET_array_grow (uuids,
                       uuids_len,
                       0);
    GNUNET_JSON_parse_free (spec);
    return res;
  }
}


/* end of taler-merchant-httpd_private-post-orders.c */