diff options
| -rw-r--r-- | src/exchange/Makefile.am | 1 | ||||
| -rw-r--r-- | src/exchange/taler-exchange-httpd.c | 9 | ||||
| -rw-r--r-- | src/exchange/taler-exchange-httpd_deposit.c | 112 | ||||
| -rw-r--r-- | src/exchange/taler-exchange-httpd_deposit.h | 10 | ||||
| -rw-r--r-- | src/exchange/taler-exchange-httpd_refund.c | 146 | ||||
| -rw-r--r-- | src/exchange/taler-exchange-httpd_refund.h | 52 | ||||
| -rw-r--r-- | src/include/taler_exchange_service.h | 77 | ||||
| -rw-r--r-- | src/include/taler_exchangedb_plugin.h | 61 | ||||
| -rw-r--r-- | src/include/taler_signatures.h | 58 |
9 files changed, 441 insertions, 85 deletions
diff --git a/src/exchange/Makefile.am b/src/exchange/Makefile.am index 8dcd2e689..3dba0bb77 100644 --- a/src/exchange/Makefile.am +++ b/src/exchange/Makefile.am @@ -35,6 +35,7 @@ taler_exchange_httpd_SOURCES = \ taler-exchange-httpd_mhd.c taler-exchange-httpd_mhd.h \ taler-exchange-httpd_parsing.c taler-exchange-httpd_parsing.h \ taler-exchange-httpd_refresh.c taler-exchange-httpd_refresh.h \ + taler-exchange-httpd_refund.c taler-exchange-httpd_refund.h \ taler-exchange-httpd_reserve.c taler-exchange-httpd_reserve.h \ taler-exchange-httpd_responses.c taler-exchange-httpd_responses.h \ taler-exchange-httpd_tracking.c taler-exchange-httpd_tracking.h \ diff --git a/src/exchange/taler-exchange-httpd.c b/src/exchange/taler-exchange-httpd.c index a533a973d..c99535382 100644 --- a/src/exchange/taler-exchange-httpd.c +++ b/src/exchange/taler-exchange-httpd.c @@ -30,6 +30,7 @@ #include "taler-exchange-httpd_mhd.h" #include "taler-exchange-httpd_admin.h" #include "taler-exchange-httpd_deposit.h" +#include "taler-exchange-httpd_refund.h" #include "taler-exchange-httpd_reserve.h" #include "taler-exchange-httpd_wire.h" #include "taler-exchange-httpd_refresh.h" @@ -200,6 +201,14 @@ handle_mhd_request (void *cls, "Only POST is allowed", 0, &TMH_MHD_handler_send_json_pack_error, MHD_HTTP_METHOD_NOT_ALLOWED }, + /* Refunding coins */ + { "/refund", MHD_HTTP_METHOD_POST, "application/json", + NULL, 0, + &TMH_REFUND_handler_refund, MHD_HTTP_OK }, + { "/refund", NULL, "text/plain", + "Only POST is allowed", 0, + &TMH_MHD_handler_send_json_pack_error, MHD_HTTP_METHOD_NOT_ALLOWED }, + /* Dealing with change */ { "/refresh/melt", MHD_HTTP_METHOD_POST, "application/json", NULL, 0, diff --git a/src/exchange/taler-exchange-httpd_deposit.c b/src/exchange/taler-exchange-httpd_deposit.c index efef3d04e..cf5142982 100644 --- a/src/exchange/taler-exchange-httpd_deposit.c +++ b/src/exchange/taler-exchange-httpd_deposit.c @@ -1,6 +1,6 @@ /* This file is part of TALER - Copyright (C) 2014, 2015 GNUnet e.V. + Copyright (C) 2014, 2015, 2016 Inria and GNUnet e.V. 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 @@ -21,9 +21,6 @@ * @author Florian Dold * @author Benedikt Mueller * @author Christian Grothoff - * - * TODO: - * - ugly if-construction for deposit type */ #include "platform.h" #include <gnunet/gnunet_util_lib.h> @@ -119,28 +116,37 @@ verify_and_execute_deposit (struct MHD_Connection *connection, /** - * Handle a "/deposit" request. This function parses the - * JSON information and then calls #verify_and_execute_deposit() - * to verify the signatures and execute the deposit. + * Handle a "/deposit" request. Parses the JSON, and, if successful, + * passes the JSON data to #verify_and_execute_deposit() to further + * check the details of the operation specified. If everything checks + * out, this will ultimately lead to the "/deposit" being executed, or + * rejected. * + * @param rh context of the handler * @param connection the MHD connection to handle - * @param root root of the posted JSON - * @param amount how much should be deposited - * @param wire json describing the wire details (?) + * @param[in,out] connection_cls the connection's closure (can be updated) + * @param upload_data upload data + * @param[in,out] upload_data_size number of bytes (left) in @a upload_data * @return MHD result code */ -static int -parse_and_handle_deposit_request (struct MHD_Connection *connection, - const json_t *root, - const struct TALER_Amount *amount, - json_t *wire) +int +TMH_DEPOSIT_handler_deposit (struct TMH_RequestHandler *rh, + struct MHD_Connection *connection, + void **connection_cls, + const char *upload_data, + size_t *upload_data_size) { + json_t *json; int res; + json_t *wire; struct TALER_EXCHANGEDB_Deposit deposit; struct TALER_EXCHANGEDB_DenominationKeyIssueInformation *dki; struct TMH_KS_StateHandle *ks; struct GNUNET_HashCode my_h_wire; + struct TALER_Amount amount; struct GNUNET_JSON_Specification spec[] = { + GNUNET_JSON_spec_json ("wire", &wire), + TALER_JSON_spec_amount ("f", &amount), TALER_JSON_spec_denomination_public_key ("denom_pub", &deposit.coin.denom_pub), TALER_JSON_spec_denomination_signature ("ub_sig", &deposit.coin.denom_sig), GNUNET_JSON_spec_fixed_auto ("coin_pub", &deposit.coin.coin_pub), @@ -155,10 +161,20 @@ parse_and_handle_deposit_request (struct MHD_Connection *connection, GNUNET_JSON_spec_end () }; + res = TMH_PARSE_post_json (connection, + connection_cls, + upload_data, + upload_data_size, + &json); + if (GNUNET_SYSERR == res) + return MHD_NO; + if ( (GNUNET_NO == res) || (NULL == json) ) + return MHD_YES; memset (&deposit, 0, sizeof (deposit)); res = TMH_PARSE_json_data (connection, - root, + json, spec); + json_decref (json); if (GNUNET_SYSERR == res) return MHD_NO; /* hard failure */ if (GNUNET_NO == res) @@ -205,12 +221,12 @@ parse_and_handle_deposit_request (struct MHD_Connection *connection, &dki->issue.properties.fee_deposit); TMH_KS_release (ks); deposit.wire = wire; - deposit.amount_with_fee = *amount; + deposit.amount_with_fee = amount; if (-1 == TALER_amount_cmp (&deposit.amount_with_fee, &deposit.deposit_fee)) { /* Total amount smaller than fee, invalid */ - GNUNET_JSON_parse_free (spec); + GNUNET_JSON_parse_free (spec); return TMH_RESPONSE_reply_arg_invalid (connection, "f"); } @@ -221,64 +237,4 @@ parse_and_handle_deposit_request (struct MHD_Connection *connection, } -/** - * Handle a "/deposit" request. Parses the JSON in the post to find - * the "type" (either DIRECT_DEPOSIT or INCREMENTAL_DEPOSIT), and, if - * successful, passes the JSON data to - * #parse_and_handle_deposit_request() to further check the details - * of the operation specified in the "wire" field of the JSON data. - * If everything checks out, this will ultimately lead to the - * "/deposit" being executed, or rejected. - * - * @param rh context of the handler - * @param connection the MHD connection to handle - * @param[in,out] connection_cls the connection's closure (can be updated) - * @param upload_data upload data - * @param[in,out] upload_data_size number of bytes (left) in @a upload_data - * @return MHD result code - */ -int -TMH_DEPOSIT_handler_deposit (struct TMH_RequestHandler *rh, - struct MHD_Connection *connection, - void **connection_cls, - const char *upload_data, - size_t *upload_data_size) -{ - json_t *json; - json_t *wire; - int res; - struct TALER_Amount amount; - struct GNUNET_JSON_Specification spec[] = { - GNUNET_JSON_spec_json ("wire", &wire), - TALER_JSON_spec_amount ("f", &amount), - GNUNET_JSON_spec_end () - }; - - res = TMH_PARSE_post_json (connection, - connection_cls, - upload_data, - upload_data_size, - &json); - if (GNUNET_SYSERR == res) - return MHD_NO; - if ( (GNUNET_NO == res) || (NULL == json) ) - return MHD_YES; - res = TMH_PARSE_json_data (connection, - json, - spec); - if (GNUNET_OK != res) - { - json_decref (json); - return (GNUNET_NO == res) ? MHD_YES : MHD_NO; - } - res = parse_and_handle_deposit_request (connection, - json, - &amount, - wire); - GNUNET_JSON_parse_free (spec); - json_decref (json); - return res; -} - - /* end of taler-exchange-httpd_deposit.c */ diff --git a/src/exchange/taler-exchange-httpd_deposit.h b/src/exchange/taler-exchange-httpd_deposit.h index 6e84573e5..89f1ca56c 100644 --- a/src/exchange/taler-exchange-httpd_deposit.h +++ b/src/exchange/taler-exchange-httpd_deposit.h @@ -29,13 +29,9 @@ /** - * Handle a "/deposit" request. Parses the JSON in the post to find - * the "type" (either DIRECT_DEPOSIT or INCREMENTAL_DEPOSIT), and, if - * successful, passes the JSON data to - * #parse_and_handle_deposit_request() to further check the details - * of the operation specified in the "wire" field of the JSON data. - * If everything checks out, this will ultimately lead to the - * "/deposit" being executed, or rejected. + * Handle a "/deposit" request. Parses the JSON, and, if successful, + * checks the signatures. If everything checks out, this will + * ultimately lead to the "/deposit" being executed, or rejected. * * @param rh context of the handler * @param connection the MHD connection to handle diff --git a/src/exchange/taler-exchange-httpd_refund.c b/src/exchange/taler-exchange-httpd_refund.c new file mode 100644 index 000000000..c5f24000d --- /dev/null +++ b/src/exchange/taler-exchange-httpd_refund.c @@ -0,0 +1,146 @@ +/* + This file is part of TALER + Copyright (C) 2014, 2015, 2016 Inria and GNUnet e.V. + + 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 Affero General Public License for more details. + + You should have received a copy of the GNU Affero General Public License along with + TALER; see the file COPYING. If not, If not, see <http://www.gnu.org/licenses/> +*/ +/** + * @file taler-exchange-httpd_refund.c + * @brief Handle /refund requests; parses the POST and JSON and + * verifies the coin signature before handing things off + * to the database. + * @author Florian Dold + * @author Benedikt Mueller + * @author Christian Grothoff + */ +#include "platform.h" +#include <gnunet/gnunet_util_lib.h> +#include <gnunet/gnunet_json_lib.h> +#include <jansson.h> +#include <microhttpd.h> +#include <pthread.h> +#include "taler_json_lib.h" +#include "taler-exchange-httpd_parsing.h" +#include "taler-exchange-httpd_refund.h" +#include "taler-exchange-httpd_responses.h" +#include "taler-exchange-httpd_keystate.h" +#include "taler-exchange-httpd_validation.h" + + +/** + * We have parsed the JSON information about the refund, do some basic + * sanity checks (especially that the signature on the coin is valid) + * and then execute the refund. Note that we need the DB to check + * the fee structure, so this is not done here. + * + * @param connection the MHD connection to handle + * @param refund information about the refund + * @return MHD result code + */ +static int +verify_and_execute_refund (struct MHD_Connection *connection, + const struct TALER_EXCHANGEDB_Refund *refund) +{ + struct TALER_RefundRequestPS dr; + + dr.purpose.purpose = htonl (TALER_SIGNATURE_MERCHANT_REFUND); + dr.purpose.size = htonl (sizeof (struct TALER_RefundRequestPS)); + dr.h_contract = refund->h_contract; + dr.transaction_id = GNUNET_htonll (refund->transaction_id); + dr.rtransaction_id = GNUNET_htonll (refund->rtransaction_id); + TALER_amount_hton (&dr.refund_amount, + &refund->refund_amount); + TALER_amount_hton (&dr.refund_fee, + &refund->refund_fee); + dr.merchant = refund->merchant_pub; + dr.coin_pub = refund->coin.coin_pub; + if (GNUNET_OK != + GNUNET_CRYPTO_eddsa_verify (TALER_SIGNATURE_MERCHANT_REFUND, + &dr.purpose, + &refund->merchant_sig.eddsa_sig, + &refund->merchant_pub.eddsa_pub)) + { + TALER_LOG_WARNING ("Invalid signature on /refund request\n"); + return TMH_RESPONSE_reply_signature_invalid (connection, + "merchant_sig"); + } +#if 1 + GNUNET_break (0); // FIXME: not implemented + return MHD_NO; +#else + return TMH_DB_execute_refund (connection, + refund); +#endif +} + + +/** + * Handle a "/refund" request. Parses the JSON, and, if successful, + * passes the JSON data to #parse_and_handle_refund_request() to + * further check the details of the operation specified. If + * everything checks out, this will ultimately lead to the "/refund" + * being executed, or rejected. + * + * @param rh context of the handler + * @param connection the MHD connection to handle + * @param[in,out] connection_cls the connection's closure (can be updated) + * @param upload_data upload data + * @param[in,out] upload_data_size number of bytes (left) in @a upload_data + * @return MHD result code + */ +int +TMH_REFUND_handler_refund (struct TMH_RequestHandler *rh, + struct MHD_Connection *connection, + void **connection_cls, + const char *upload_data, + size_t *upload_data_size) +{ + json_t *json; + int res; + struct TALER_EXCHANGEDB_Refund refund; + struct GNUNET_JSON_Specification spec[] = { + TALER_JSON_spec_amount ("refund_amount", &refund.refund_amount), + TALER_JSON_spec_amount ("refund_fee", &refund.refund_fee), + GNUNET_JSON_spec_fixed_auto ("H_contract", &refund.h_contract), + GNUNET_JSON_spec_uint64 ("transaction_id", &refund.transaction_id), + GNUNET_JSON_spec_fixed_auto ("coin_pub", &refund.coin.coin_pub), + GNUNET_JSON_spec_fixed_auto ("merchant_pub", &refund.merchant_pub), + GNUNET_JSON_spec_uint64 ("rtransaction_id", &refund.rtransaction_id), + GNUNET_JSON_spec_fixed_auto ("merchant_sig", &refund.merchant_sig), + GNUNET_JSON_spec_end () + }; + + res = TMH_PARSE_post_json (connection, + connection_cls, + upload_data, + upload_data_size, + &json); + if (GNUNET_SYSERR == res) + return MHD_NO; + if ( (GNUNET_NO == res) || (NULL == json) ) + return MHD_YES; + res = TMH_PARSE_json_data (connection, + json, + spec); + json_decref (json); + if (GNUNET_SYSERR == res) + return MHD_NO; /* hard failure */ + if (GNUNET_NO == res) + return MHD_YES; /* failure */ + res = verify_and_execute_refund (connection, + &refund); + GNUNET_JSON_parse_free (spec); + return res; +} + + +/* end of taler-exchange-httpd_refund.c */ diff --git a/src/exchange/taler-exchange-httpd_refund.h b/src/exchange/taler-exchange-httpd_refund.h new file mode 100644 index 000000000..750b08548 --- /dev/null +++ b/src/exchange/taler-exchange-httpd_refund.h @@ -0,0 +1,52 @@ +/* + This file is part of TALER + Copyright (C) 2014, 2015, 2016 GNUnet e.V. + + 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 Affero General Public License for more details. + + You should have received a copy of the GNU Affero General Public License along with + TALER; see the file COPYING. If not, If not, see <http://www.gnu.org/licenses/> +*/ +/** + * @file taler-exchange-httpd_refund.h + * @brief Handle /refund requests + * @author Florian Dold + * @author Benedikt Mueller + * @author Christian Grothoff + */ +#ifndef TALER_EXCHANGE_HTTPD_REFUND_H +#define TALER_EXCHANGE_HTTPD_REFUND_H + +#include <gnunet/gnunet_util_lib.h> +#include <microhttpd.h> +#include "taler-exchange-httpd.h" + + +/** + * Handle a "/refund" request. Parses the JSON, and, if successful, + * passes the JSON data to #parse_and_handle_refund_request() to + * further check the details of the operation specified. If + * everything checks out, this will ultimately lead to the "/refund" + * being executed, or rejected. + * + * @param rh context of the handler + * @param connection the MHD connection to handle + * @param[in,out] connection_cls the connection's closure (can be updated) + * @param upload_data upload data + * @param[in,out] upload_data_size number of bytes (left) in @a upload_data + * @return MHD result code + */ +int +TMH_REFUND_handler_refund (struct TMH_RequestHandler *rh, + struct MHD_Connection *connection, + void **connection_cls, + const char *upload_data, + size_t *upload_data_size); + +#endif diff --git a/src/include/taler_exchange_service.h b/src/include/taler_exchange_service.h index ffd420586..2f9a1932c 100644 --- a/src/include/taler_exchange_service.h +++ b/src/include/taler_exchange_service.h @@ -465,6 +465,83 @@ void TALER_EXCHANGE_deposit_cancel (struct TALER_EXCHANGE_DepositHandle *deposit); +/* ********************* /refund *********************** */ + +/** + * @brief A Refund Handle + */ +struct TALER_EXCHANGE_RefundHandle; + + +/** + * Callbacks of this type are used to serve the result of submitting a + * deposit permission request to a exchange. + * + * @param cls closure + * @param http_status HTTP response code, #MHD_HTTP_OK (200) for successful deposit; + * 0 if the exchange's reply is bogus (fails to follow the protocol) + * @param obj the received JSON reply, should be kept as proof (and, in particular, + * be forwarded to the customer) + */ +typedef void +(*TALER_EXCHANGE_RefundResultCallback) (void *cls, + unsigned int http_status, + const json_t *obj); + + +/** + * Submit a refund request to the exchange and get the exchange's + * response. This API is used by a merchant. Note that + * while we return the response verbatim to the caller for further + * processing, we do already verify that the response is well-formed + * (i.e. that signatures included in the response are all valid). If + * the exchange's reply is not well-formed, we return an HTTP status code + * of zero to @a cb. + * + * The @a exchange must be ready to operate (i.e. have + * finished processing the /keys reply). If this check fails, we do + * NOT initiate the transaction with the exchange and instead return NULL. + * + * @param exchange the exchange handle; the exchange must be ready to operate + * @param amount the amount to be refunded; must be larger than the refund fee + * (as that fee is still being subtracted), and smaller than the amount + * (with deposit fee) of the original deposit contribution of this coin + * @param h_contract hash of the contact of the merchant with the customer that is being refunded + * @param transaction_id transaction id for the transaction being refunded, must match @a h_contract + * @param coin_pub coin’s public key of the coin from the original deposit operation + * @param rtransaction_id transaction id for the transaction between merchant and customer (of refunding operation); + * this is needed as we may first do a partial refund and later a full refund. If both + * refunds are also over the same amount, we need the @a rtransaction_id to make the disjoint + * refund requests different (as requests are idempotent and otherwise the 2nd refund might not work). + * @param merchant_priv the private key of the merchant, used to generate signature for refund request + * @param cb the callback to call when a reply for this request is available + * @param cb_cls closure for the above callback + * @return a handle for this request; NULL if the inputs are invalid (i.e. + * signatures fail to verify). In this case, the callback is not called. + */ +struct TALER_EXCHANGE_RefundHandle * +TALER_EXCHANGE_refund (struct TALER_EXCHANGE_Handle *exchange, + const struct TALER_Amount *amount, + const struct GNUNET_HashCode *h_contract, + const struct TALER_CoinSpendPublicKeyP *coin_pub, + uint64_t rtransaction_id, + const struct TALER_MerchantPrivateKeyP *merchant_priv, + TALER_EXCHANGE_RefundResultCallback cb, + void *cb_cls); + + +/** + * Cancel a refund permission request. This function cannot be used + * on a request handle if a response is already served for it. If + * this function is called, the refund may or may not have happened. + * However, it is fine to try to refund the coin a second time. + * + * @param refund the refund request handle + */ +void +TALER_EXCHANGE_refund_cancel (struct TALER_EXCHANGE_RefundHandle *refund); + + /* ********************* /reserve/status *********************** */ diff --git a/src/include/taler_exchangedb_plugin.h b/src/include/taler_exchangedb_plugin.h index 3646981cd..e364d6b95 100644 --- a/src/include/taler_exchangedb_plugin.h +++ b/src/include/taler_exchangedb_plugin.h @@ -299,6 +299,67 @@ struct TALER_EXCHANGEDB_Deposit /** + * @brief Specification for a /refund operation. The combination of + * the coin's public key, the merchant's public key and the + * transaction ID must be unique. While a coin can (theoretically) be + * deposited at the same merchant twice (with partial spending), the + * merchant must either use a different public key or a different + * transaction ID for the two transactions. The same goes for + * refunds, hence we also have a "rtransaction" ID which is disjoint + * from the transaction ID. The same coin must not be used twice at + * the same merchant for the same transaction or rtransaction ID. + */ +struct TALER_EXCHANGEDB_Refund +{ + /** + * Information about the coin that is being refunded. + */ + struct TALER_CoinPublicInfo coin; + + /** + * Public key of the merchant. + */ + struct TALER_MerchantPublicKeyP merchant_pub; + + /** + * Signature from the merchant affirming the refund. + */ + struct TALER_MerchantSignatureP merchant_sig; + + /** + * Hash over the contract between merchant and customer + * (remains unknown to the Exchange). + */ + struct GNUNET_HashCode h_contract; + + /** + * Merchant-generated transaction ID to detect duplicate + * transactions, of the original transaction that is being + * refunded. + */ + uint64_t transaction_id; + + /** + * Merchant-generated REFUND transaction ID to detect duplicate + * refunds. + */ + uint64_t rtransaction_id; + + /** + * Fraction of the original deposit's value to be refunded, including + * refund fee (if any). The coin is identified by @e coin_pub. + */ + struct TALER_Amount refund_amount; + + /** + * Refund fee to be covered by the customer. + */ + struct TALER_Amount refund_fee; + +}; + + +/** * @brief Global information for a refreshing session. Includes * dimensions of the operation, security parameters and * client signatures from "/refresh/melt" and "/refresh/commit". diff --git a/src/include/taler_signatures.h b/src/include/taler_signatures.h index 154e11610..f1586aa8c 100644 --- a/src/include/taler_signatures.h +++ b/src/include/taler_signatures.h @@ -396,6 +396,64 @@ struct TALER_DepositConfirmationPS /** + * @brief Format used to generate the signature on a request to refund + * a coin into the account of the customer. + */ +struct TALER_RefundRequestPS +{ + /** + * Purpose must be #TALER_SIGNATURE_MERCHANT_REFUND. + */ + struct GNUNET_CRYPTO_EccSignaturePurpose purpose; + + /** + * Hash over the contract which is being refunded. + */ + struct GNUNET_HashCode h_contract GNUNET_PACKED; + + /** + * Merchant-generated transaction ID of the orginal transaction. + */ + uint64_t transaction_id GNUNET_PACKED; + + /** + * The coin's public key. This is the value that must have been + * signed (blindly) by the Exchange. + */ + struct TALER_CoinSpendPublicKeyP coin_pub; + + /** + * The Merchant's public key. Allows the merchant to later refund + * the transaction or to inquire about the wire transfer identifier. + */ + struct TALER_MerchantPublicKeyP merchant; + + /** + * Merchant-generated transaction ID for the refund. + */ + uint64_t rtransaction_id GNUNET_PACKED; + + /** + * Amount to be refunded, including refund fee charged by the + * exchange to the customer. + */ + struct TALER_AmountNBO refund_amount; + + /** + * Refund fee charged by the exchange. This must match the + * Exchange's denomination key's refund fee. If the client puts in + * an invalid refund fee (too high or too low) that does not match + * the Exchange's denomination key, the refund operation is invalid + * and will be rejected by the exchange. The @e amount_with_fee + * minus the @e refund_fee is the amount that will be credited to + * the original coin. + */ + struct TALER_AmountNBO refund_fee; + +}; + + +/** * @brief Message signed by a coin to indicate that the coin should be * melted. */ |