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+..
+ This file is part of GNU TALER.
+ Copyright (C) 2014, 2015, 2016 GNUnet e.V. and INRIA
+ TALER is free software; you can redistribute it and/or modify it under the
+ terms of the GNU General Public License as published by the Free Software
+ Foundation; either version 2.1, 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 Lesser General Public License for more details.
+ You should have received a copy of the GNU Lesser General Public License along with
+ TALER; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
+
+ @author Marcello Stanisci
+
+..
+ The reason to have a dedicate page for error codes was due to a buggy
+ behaviour in pages cross-linking: was not possible from other pages to
+ reference the '_error-codes' label (see just below) if we kept in api-common.rst
+ (which is the best place to place this error codes list).
+
+-----------
+Error Codes
+-----------
+
+The following list shows error codes defined in
+`<EXCHANGE-REPO>/src/include/taler_error_codes.h <https://git.taler.net/exchange.git/tree/src/include/taler_error_codes.h>`_
+
+.. _error-codes:
+.. code-block:: c
+
+ /**
+ * Enumeration with all possible Taler error codes.
+ */
+ enum TALER_ErrorCode {
+
+ /**
+ * Special code to indicate no error (or no "code" present).
+ */
+ TALER_EC_NONE = 0,
+
+ /**
+ * Special code to indicate that a non-integer error code was
+ * returned in the JSON response.
+ */
+ TALER_EC_INVALID = 1,
+
+ /**
+ * The response we got from the server was not even in JSON format.
+ */
+ TALER_EC_INVALID_RESPONSE = 2,
+
+ /**
+ * Generic implementation error: this function was not yet implemented.
+ */
+ TALER_EC_NOT_IMPLEMENTED = 3,
+
+ /* ********** generic error codes ************* */
+
+ /**
+ * The exchange failed to even just initialize its connection to the
+ * database.
+ * This response is provided with HTTP status code
+ * MHD_HTTP_INTERNAL_SERVER_ERROR.
+ */
+ TALER_EC_DB_SETUP_FAILED = 1001,
+
+ /**
+ * The exchange encountered an error event to just start
+ * the database transaction.
+ * This response is provided with HTTP status code
+ * MHD_HTTP_INTERNAL_SERVER_ERROR.
+ */
+ TALER_EC_DB_START_FAILED = 1002,
+
+ /**
+ * The exchange encountered an error event to commit
+ * the database transaction (hard, unrecoverable error).
+ * This response is provided with HTTP status code
+ * MHD_HTTP_INTERNAL_SERVER_ERROR.
+ */
+ TALER_EC_DB_COMMIT_FAILED_HARD = 1003,
+
+ /**
+ * The exchange encountered an error event to commit
+ * the database transaction, even after repeatedly
+ * retrying it there was always a conflicting transaction.
+ * (This indicates a repeated serialization error; should
+ * only happen if some client maliciously tries to create
+ * conflicting concurrent transactions.)
+ * This response is provided with HTTP status code
+ * MHD_HTTP_INTERNAL_SERVER_ERROR.
+ */
+ TALER_EC_DB_COMMIT_FAILED_ON_RETRY = 1004,
+
+ /**
+ * The exchange had insufficient memory to parse the request. This
+ * response is provided with HTTP status code
+ * MHD_HTTP_INTERNAL_SERVER_ERROR.
+ */
+ TALER_EC_PARSER_OUT_OF_MEMORY = 1005,
+
+ /**
+ * The JSON in the client's request to the exchange was malformed.
+ * (Generic parse error).
+ * This response is provided with HTTP status code
+ * MHD_HTTP_BAD_REQUEST.
+ */
+ TALER_EC_JSON_INVALID = 1006,
+
+ /**
+ * The JSON in the client's request to the exchange was malformed.
+ * Details about the location of the parse error are provided.
+ * This response is provided with HTTP status code
+ * MHD_HTTP_BAD_REQUEST.
+ */
+ TALER_EC_JSON_INVALID_WITH_DETAILS = 1007,
+
+ /**
+ * A required parameter in the request to the exchange was missing.
+ * This response is provided with HTTP status code
+ * MHD_HTTP_BAD_REQUEST.
+ */
+ TALER_EC_PARAMETER_MISSING = 1008,
+
+ /**
+ * A parameter in the request to the exchange was malformed.
+ * This response is provided with HTTP status code
+ * MHD_HTTP_BAD_REQUEST.
+ */
+ TALER_EC_PARAMETER_MALFORMED = 1009,
+
+ /* ********** request-specific error codes ************* */
+
+ /**
+ * The given reserve does not have sufficient funds to admit the
+ * requested withdraw operation at this time. The response includes
+ * the current "balance" of the reserve as well as the transaction
+ * "history" that lead to this balance. This response is provided
+ * with HTTP status code MHD_HTTP_FORBIDDEN.
+ */
+ TALER_EC_WITHDRAW_INSUFFICIENT_FUNDS = 1100,
+
+ /**
+ * The exchange has no information about the "reserve_pub" that
+ * was given.
+ * This response is provided with HTTP status code MHD_HTTP_NOT_FOUND.
+ */
+ TALER_EC_WITHDRAW_RESERVE_UNKNOWN = 1101,
+
+ /**
+ * The amount to withdraw together with the fee exceeds the
+ * numeric range for Taler amounts. This is not a client
+ * failure, as the coin value and fees come from the exchange's
+ * configuration.
+ * This response is provided with HTTP status code MHD_HTTP_INTERNAL_ERROR.
+ */
+ TALER_EC_WITHDRAW_AMOUNT_FEE_OVERFLOW = 1102,
+
+ /**
+ * All of the deposited amounts into this reserve total up to a
+ * value that is too big for the numeric range for Taler amounts.
+ * This is not a client failure, as the transaction history comes
+ * from the exchange's configuration. This response is provided
+ * with HTTP status code MHD_HTTP_INTERNAL_ERROR.
+ */
+ TALER_EC_WITHDRAW_AMOUNT_DEPOSITS_OVERFLOW = 1103,
+
+ /**
+ * For one of the historic withdrawals from this reserve, the
+ * exchange could not find the denomination key.
+ * This is not a client failure, as the transaction history comes
+ * from the exchange's configuration. This response is provided
+ * with HTTP status code MHD_HTTP_INTERNAL_ERROR.
+ */
+ TALER_EC_WITHDRAW_HISTORIC_DENOMINATION_KEY_NOT_FOUND = 1104,
+
+ /**
+ * All of the withdrawals from reserve total up to a
+ * value that is too big for the numeric range for Taler amounts.
+ * This is not a client failure, as the transaction history comes
+ * from the exchange's configuration. This response is provided
+ * with HTTP status code MHD_HTTP_INTERNAL_ERROR.
+ */
+ TALER_EC_WITHDRAW_AMOUNT_WITHDRAWALS_OVERFLOW = 1105,
+
+ /**
+ * The exchange somehow knows about this reserve, but there seem to
+ * have been no wire transfers made. This is not a client failure,
+ * as this is a database consistency issue of the exchange. This
+ * response is provided with HTTP status code
+ * MHD_HTTP_INTERNAL_ERROR.
+ */
+ TALER_EC_WITHDRAW_RESERVE_WITHOUT_WIRE_TRANSFER = 1106,
+
+ /**
+ * The exchange failed to create the signature using the
+ * denomination key. This response is provided with HTTP status
+ * code MHD_HTTP_INTERNAL_ERROR.
+ */
+ TALER_EC_WITHDRAW_SIGNATURE_FAILED = 1107,
+
+ /**
+ * The exchange failed to store the withdraw operation in its
+ * database. This response is provided with HTTP status code
+ * MHD_HTTP_INTERNAL_ERROR.
+ */
+ TALER_EC_WITHDRAW_DB_STORE_ERROR = 1108,
+
+ /**
+ * The exchange failed to check against historic withdraw data from
+ * database (as part of ensuring the idempotency of the operation).
+ * This response is provided with HTTP status code
+ * MHD_HTTP_INTERNAL_ERROR.
+ */
+ TALER_EC_WITHDRAW_DB_FETCH_ERROR = 1109,
+
+ /**
+ * The exchange is not aware of the denomination key
+ * the wallet requested for the withdrawal.
+ * This response is provided
+ * with HTTP status code MHD_HTTP_NOT_FOUND.
+ */
+ TALER_EC_WITHDRAW_DENOMINATION_KEY_NOT_FOUND = 1110,
+
+ /**
+ * The signature of the reserve is not valid. This response is
+ * provided with HTTP status code MHD_HTTP_BAD_REQUEST.
+ */
+ TALER_EC_WITHDRAW_RESERVE_SIGNATURE_INVALID = 1111,
+
+ /**
+ * The exchange failed to obtain the transaction history of the
+ * given reserve from the database while generating an insufficient
+ * funds errors.
+ * This response is provided with HTTP status code
+ * MHD_HTTP_INTERNAL_SERVER_ERROR.
+ */
+ TALER_EC_WITHDRAW_HISTORY_DB_ERROR_INSUFFICIENT_FUNDS = 1112,
+
+ /**
+ * When computing the reserve history, we ended up with a negative
+ * overall balance, which should be impossible.
+ * This response is provided with HTTP status code
+ * MHD_HTTP_INTERNAL_SERVER_ERROR.
+ */
+ TALER_EC_WITHDRAW_RESERVE_HISTORY_IMPOSSIBLE = 1113,
+
+ /**
+ * The exchange failed to obtain the transaction history of the
+ * given reserve from the database.
+ * This response is provided with HTTP status code
+ * MHD_HTTP_INTERNAL_SERVER_ERROR.
+ */
+ TALER_EC_RESERVE_STATUS_DB_ERROR = 1150,
+
+
+ /**
+ * The respective coin did not have sufficient residual value
+ * for the /deposit operation (i.e. due to double spending).
+ * The "history" in the respose provides the transaction history
+ * of the coin proving this fact. This response is provided
+ * with HTTP status code MHD_HTTP_FORBIDDEN.
+ */
+ TALER_EC_DEPOSIT_INSUFFICIENT_FUNDS = 1200,
+
+ /**
+ * The exchange failed to obtain the transaction history of the
+ * given coin from the database (this does not happen merely because
+ * the coin is seen by the exchange for the first time).
+ * This response is provided with HTTP status code
+ * MHD_HTTP_INTERNAL_SERVER_ERROR.
+ */
+ TALER_EC_DEPOSIT_HISTORY_DB_ERROR = 1201,
+
+ /**
+ * The exchange failed to store the /depost information in the
+ * database. This response is provided with HTTP status code
+ * MHD_HTTP_INTERNAL_SERVER_ERROR.
+ */
+ TALER_EC_DEPOSIT_STORE_DB_ERROR = 1202,
+
+ /**
+ * The exchange database is unaware of the denomination key that
+ * signed the coin (however, the exchange process is; this is not
+ * supposed to happen; it can happen if someone decides to purge the
+ * DB behind the back of the exchange process). Hence the deposit
+ * is being refused. This response is provided with HTTP status
+ * code MHD_HTTP_INTERNAL_SERVER_ERROR.
+ */
+ TALER_EC_DEPOSIT_DB_DENOMINATION_KEY_UNKNOWN = 1203,
+
+ /**
+ * The exchange database is unaware of the denomination key that
+ * signed the coin (however, the exchange process is; this is not
+ * supposed to happen; it can happen if someone decides to purge the
+ * DB behind the back of the exchange process). Hence the deposit
+ * is being refused. This response is provided with HTTP status
+ * code MHD_HTTP_NOT_FOUND.
+ */
+ TALER_EC_DEPOSIT_DENOMINATION_KEY_UNKNOWN = 1204,
+
+ /**
+ * The signature of the coin is not valid. This response is
+ * provided with HTTP status code MHD_HTTP_BAD_REQUEST.
+ */
+ TALER_EC_DEPOSIT_COIN_SIGNATURE_INVALID = 1205,
+
+ /**
+ * The signature of the denomination key over the coin is not valid.
+ * This response is provided with HTTP status code
+ * MHD_HTTP_BAD_REQUEST.
+ */
+ TALER_EC_DEPOSIT_DENOMINATION_SIGNATURE_INVALID = 1206,
+
+ /**
+ * The stated value of the coin after the deposit fee is subtracted
+ * would be negative.
+ * This response is provided with HTTP status code
+ * MHD_HTTP_BAD_REQUEST.
+ */
+ TALER_EC_DEPOSIT_NEGATIVE_VALUE_AFTER_FEE = 1207,
+
+ /**
+ * The stated refund deadline is after the wire deadline.
+ * This response is provided with HTTP status code
+ * MHD_HTTP_BAD_REQUEST.
+ */
+ TALER_EC_DEPOSIT_REFUND_DEADLINE_AFTER_WIRE_DEADLINE = 1208,
+
+ /**
+ * The exchange does not recognize the validity of or support the
+ * given wire format type.
+ * This response is provided
+ * with HTTP status code MHD_HTTP_BAD_REQUEST.
+ */
+ TALER_EC_DEPOSIT_INVALID_WIRE_FORMAT_TYPE = 1209,
+
+ /**
+ * The exchange failed to canonicalize and hash the given wire format.
+ * This response is provided
+ * with HTTP status code MHD_HTTP_BAD_REQUEST.
+ */
+ TALER_EC_DEPOSIT_INVALID_WIRE_FORMAT_JSON = 1210,
+
+ /**
+ * The hash of the given wire address does not match the hash
+ * specified in the contract.
+ * This response is provided
+ * with HTTP status code MHD_HTTP_BAD_REQUEST.
+ */
+ TALER_EC_DEPOSIT_INVALID_WIRE_FORMAT_CONTRACT_HASH_CONFLICT = 1211,
+
+ /**
+ * The exchange failed to obtain the transaction history of the
+ * given coin from the database while generating an insufficient
+ * funds errors.
+ * This response is provided with HTTP status code
+ * MHD_HTTP_INTERNAL_SERVER_ERROR.
+ */
+ TALER_EC_DEPOSIT_HISTORY_DB_ERROR_INSUFFICIENT_FUNDS = 1212,
+
+ /**
+ * The exchange detected that the given account number
+ * is invalid for the selected wire format type.
+ * This response is provided
+ * with HTTP status code MHD_HTTP_BAD_REQUEST.
+ */
+ TALER_EC_DEPOSIT_INVALID_WIRE_FORMAT_ACCOUNT_NUMBER = 1213,
+
+ /**
+ * The signature over the given wire details is invalid.
+ * This response is provided
+ * with HTTP status code MHD_HTTP_BAD_REQUEST.
+ */
+ TALER_EC_DEPOSIT_INVALID_WIRE_FORMAT_SIGNATURE = 1214,
+
+ /**
+ * The bank specified in the wire transfer format is not supported
+ * by this exchange.
+ * This response is provided
+ * with HTTP status code MHD_HTTP_BAD_REQUEST.
+ */
+ TALER_EC_DEPOSIT_INVALID_WIRE_FORMAT_BANK = 1215,
+
+ /**
+ * No wire format type was specified in the JSON wire format
+ * details.
+ * This response is provided
+ * with HTTP status code MHD_HTTP_BAD_REQUEST.
+ */
+ TALER_EC_DEPOSIT_INVALID_WIRE_FORMAT_TYPE_MISSING = 1216,
+
+ /**
+ * The given wire format type is not supported by this
+ * exchange.
+ * This response is provided
+ * with HTTP status code MHD_HTTP_BAD_REQUEST.
+ */
+ TALER_EC_DEPOSIT_INVALID_WIRE_FORMAT_TYPE_UNSUPPORTED = 1217,
+
+
+ /**
+ * The respective coin did not have sufficient residual value
+ * for the /refresh/melt operation. The "history" in this
+ * response provdes the "residual_value" of the coin, which may
+ * be less than its "original_value". This response is provided
+ * with HTTP status code MHD_HTTP_FORBIDDEN.
+ */
+ TALER_EC_REFRESH_MELT_INSUFFICIENT_FUNDS = 1300,
+
+ /**
+ * The exchange is unaware of the denomination key that was
+ * used to sign the melted coin. This response is provided
+ * with HTTP status code MHD_HTTP_NOT_FOUND.
+ */
+ TALER_EC_REFRESH_MELT_DENOMINATION_KEY_NOT_FOUND = 1301,
+
+ /**
+ * The exchange had an internal error reconstructing the
+ * transaction history of the coin that was being melted.
+ * This response is provided with HTTP status code
+ * MHD_HTTP_INTERNAL_SERVER_ERROR.
+ */
+ TALER_EC_REFRESH_MELT_COIN_HISTORY_COMPUTATION_FAILED = 1302,
+
+ /**
+ * The exchange failed to check against historic melt data from
+ * database (as part of ensuring the idempotency of the operation).
+ * This response is provided with HTTP status code
+ * MHD_HTTP_INTERNAL_ERROR.
+ */
+ TALER_EC_REFRESH_MELT_DB_FETCH_ERROR = 1303,
+
+ /**
+ * The exchange failed to store session data in the
+ * database.
+ * This response is provided with HTTP status code
+ * MHD_HTTP_INTERNAL_ERROR.
+ */
+ TALER_EC_REFRESH_MELT_DB_STORE_SESSION_ERROR = 1304,
+
+ /**
+ * The exchange failed to store refresh order data in the
+ * database.
+ * This response is provided with HTTP status code
+ * MHD_HTTP_INTERNAL_ERROR.
+ */
+ TALER_EC_REFRESH_MELT_DB_STORE_ORDER_ERROR = 1305,
+
+ /**
+ * The exchange failed to store commit data in the
+ * database.
+ * This response is provided with HTTP status code
+ * MHD_HTTP_INTERNAL_ERROR.
+ */
+ TALER_EC_REFRESH_MELT_DB_STORE_COMMIT_ERROR = 1306,
+
+ /**
+ * The exchange failed to store transfer keys in the
+ * database.
+ * This response is provided with HTTP status code
+ * MHD_HTTP_INTERNAL_ERROR.
+ */
+ TALER_EC_REFRESH_MELT_DB_STORE_TRANSFER_ERROR = 1307,
+
+ /**
+ * The exchange is unaware of the denomination key that was
+ * requested for one of the fresh coins. This response is provided
+ * with HTTP status code MHD_HTTP_BAD_REQUEST.
+ */
+ TALER_EC_REFRESH_MELT_FRESH_DENOMINATION_KEY_NOT_FOUND = 1308,
+
+ /**
+ * The exchange encountered a numeric overflow totaling up
+ * the cost for the refresh operation. This response is provided
+ * with HTTP status code MHD_HTTP_INTERNAL_SERVER_ERROR.
+ */
+ TALER_EC_REFRESH_MELT_COST_CALCULATION_OVERFLOW = 1309,
+
+ /**
+ * During the transaction phase, the exchange could suddenly
+ * no longer find the denomination key that was
+ * used to sign the melted coin. This response is provided
+ * with HTTP status code MHD_HTTP_INTERNAL_SERVER_ERROR.
+ */
+ TALER_EC_REFRESH_MELT_DB_DENOMINATION_KEY_NOT_FOUND = 1310,
+
+ /**
+ * The exchange encountered melt fees exceeding the melted
+ * coin's contribution. This response is provided
+ * with HTTP status code MHD_HTTP_BAD_REQUEST.
+ */
+ TALER_EC_REFRESH_MELT_FEES_EXCEED_CONTRIBUTION = 1311,
+
+ /**
+ * The exchange's cost calculation does not add up to the
+ * melt fees specified in the request. This response is provided
+ * with HTTP status code MHD_HTTP_BAD_REQUEST.
+ */
+ TALER_EC_REFRESH_MELT_FEES_MISSMATCH = 1312,
+
+ /**
+ * The denomination key signature on the melted coin is invalid.
+ * This response is provided with HTTP status code
+ * MHD_HTTP_BAD_REQUEST.
+ */
+ TALER_EC_REFRESH_MELT_DENOMINATION_SIGNATURE_INVALID = 1313,
+
+ /**
+ * The exchange's cost calculation shows that the melt amount
+ * is below the costs of the transaction. This response is provided
+ * with HTTP status code MHD_HTTP_BAD_REQUEST.
+ */
+ TALER_EC_REFRESH_MELT_AMOUNT_INSUFFICIENT = 1314,
+
+ /**
+ * The signature made with the coin to be melted is invalid.
+ * This response is provided with HTTP status code
+ * MHD_HTTP_BAD_REQUEST.
+ */
+ TALER_EC_REFRESH_MELT_COIN_SIGNATURE_INVALID = 1315,
+
+ /**
+ * The size of the cut-and-choose dimension of the
+ * blinded coins request does not match #TALER_CNC_KAPPA.
+ * This response is provided with HTTP status code
+ * MHD_HTTP_BAD_REQUEST.
+ */
+ TALER_EC_REFRESH_MELT_CNC_COIN_ARRAY_SIZE_INVALID = 1316,
+
+ /**
+ * The size of the cut-and-choose dimension of the
+ * transfer keys request does not match #TALER_CNC_KAPPA.
+ * This response is provided with HTTP status code
+ * MHD_HTTP_BAD_REQUEST.
+ */
+ TALER_EC_REFRESH_MELT_CNC_TRANSFER_ARRAY_SIZE_INVALID = 1317,
+
+ /**
+ * The exchange failed to obtain the transaction history of the
+ * given coin from the database while generating an insufficient
+ * funds errors.
+ * This response is provided with HTTP status code
+ * MHD_HTTP_INTERNAL_SERVER_ERROR.
+ */
+ TALER_EC_REFRESH_MELT_HISTORY_DB_ERROR_INSUFFICIENT_FUNDS = 1318,
+
+ /**
+ * The provided transfer keys do not match up with the
+ * original commitment. Information about the original
+ * commitment is included in the response. This response is
+ * provided with HTTP status code MHD_HTTP_CONFLICT.
+ */
+ TALER_EC_REFRESH_REVEAL_COMMITMENT_VIOLATION = 1350,
+
+ /**
+ * Failed to blind the envelope to reconstruct the blinded
+ * coins for revealation checks.
+ * This response is provided with HTTP status code
+ * MHD_HTTP_INTERNAL_ERROR.
+ */
+ TALER_EC_REFRESH_REVEAL_BLINDING_ERROR = 1351,
+
+ /**
+ * Failed to produce the blinded signatures over the coins
+ * to be returned.
+ * This response is provided with HTTP status code
+ * MHD_HTTP_INTERNAL_ERROR.
+ */
+ TALER_EC_REFRESH_REVEAL_SIGNING_ERROR = 1352,
+
+ /**
+ * The exchange is unaware of the refresh sessino specified in
+ * the request.
+ * This response is provided with HTTP status code
+ * MHD_HTTP_BAD_REQUEST.
+ */
+ TALER_EC_REFRESH_REVEAL_SESSION_UNKNOWN = 1353,
+
+ /**
+ * The exchange failed to retrieve valid session data from the
+ * database.
+ * This response is provided with HTTP status code
+ * MHD_HTTP_INTERNAL_ERROR.
+ */
+ TALER_EC_REFRESH_REVEAL_DB_FETCH_SESSION_ERROR = 1354,
+
+ /**
+ * The exchange failed to retrieve order data from the
+ * database.
+ * This response is provided with HTTP status code
+ * MHD_HTTP_INTERNAL_ERROR.
+ */
+ TALER_EC_REFRESH_REVEAL_DB_FETCH_ORDER_ERROR = 1355,
+
+ /**
+ * The exchange failed to retrieve transfer keys from the
+ * database.
+ * This response is provided with HTTP status code
+ * MHD_HTTP_INTERNAL_ERROR.
+ */
+ TALER_EC_REFRESH_REVEAL_DB_FETCH_TRANSFER_ERROR = 1356,
+
+ /**
+ * The exchange failed to retrieve commitment data from the
+ * database.
+ * This response is provided with HTTP status code
+ * MHD_HTTP_INTERNAL_ERROR.
+ */
+ TALER_EC_REFRESH_REVEAL_DB_FETCH_COMMIT_ERROR = 1357,
+
+ /**
+ * The size of the cut-and-choose dimension of the
+ * private transfer keys request does not match #TALER_CNC_KAPPA - 1.
+ * This response is provided with HTTP status code
+ * MHD_HTTP_BAD_REQUEST.
+ */
+ TALER_EC_REFRESH_REVEAL_CNC_TRANSFER_ARRAY_SIZE_INVALID = 1358,
+
+
+ /**
+ * The coin specified in the link request is unknown to the exchange.
+ * This response is provided with HTTP status code
+ * MHD_HTTP_NOT_FOUND.
+ */
+ TALER_EC_REFRESH_LINK_COIN_UNKNOWN = 1400,
+
+
+ /**
+ * The exchange knows literally nothing about the coin we were asked
+ * to refund. But without a transaction history, we cannot issue a
+ * refund. This is kind-of OK, the owner should just refresh it
+ * directly without executing the refund. This response is provided
+ * with HTTP status code MHD_HTTP_NOT_FOUND.
+ */
+ TALER_EC_REFUND_COIN_NOT_FOUND = 1500,
+
+ /**
+ * We could not process the refund request as the coin's transaction
+ * history does not permit the requested refund at this time. The
+ * "history" in the response proves this. This response is provided
+ * with HTTP status code MHD_HTTP_CONFLICT.
+ */
+ TALER_EC_REFUND_CONFLICT = 1501,
+
+ /**
+ * The exchange knows about the coin we were asked to refund, but
+ * not about the specific /deposit operation. Hence, we cannot
+ * issue a refund (as we do not know if this merchant public key is
+ * authorized to do a refund). This response is provided with HTTP
+ * status code MHD_HTTP_NOT_FOUND.
+ */
+ TALER_EC_REFUND_DEPOSIT_NOT_FOUND = 1503,
+
+ /**
+ * The currency specified for the refund is different from
+ * the currency of the coin. This response is provided with HTTP
+ * status code MHD_HTTP_PRECONDITION_FAILED.
+ */
+ TALER_EC_REFUND_CURRENCY_MISSMATCH = 1504,
+
+ /**
+ * When we tried to check if we already paid out the coin, the
+ * exchange's database suddenly disagreed with data it previously
+ * provided (internal inconsistency).
+ * This response is provided with HTTP status code
+ * MHD_HTTP_INTERNAL_SERVER_ERROR.
+ */
+ TALER_EC_REFUND_DB_INCONSISTENT = 1505,
+
+ /**
+ * The exchange can no longer refund the customer/coin as the
+ * money was already transferred (paid out) to the merchant.
+ * (It should be past the refund deadline.)
+ * This response is provided with HTTP status code
+ * MHD_HTTP_GONE.
+ */
+ TALER_EC_REFUND_MERCHANT_ALREADY_PAID = 1506,
+
+ /**
+ * The amount the exchange was asked to refund exceeds
+ * (with fees) the total amount of the deposit (including fees).
+ * This response is provided with HTTP status code
+ * MHD_HTTP_PRECONDITION_FAILED.
+ */
+ TALER_EC_REFUND_INSUFFICIENT_FUNDS = 1507,
+
+ /**
+ * The exchange failed to recover information about the
+ * denomination key of the refunded coin (even though it
+ * recognizes the key). Hence it could not check the fee
+ * strucutre.
+ * This response is provided with HTTP status code
+ * MHD_HTTP_INTERNAL_SERVER_ERROR.
+ */
+ TALER_EC_REFUND_DENOMINATION_KEY_NOT_FOUND = 1508,
+
+ /**
+ * The refund fee specified for the request is lower than
+ * the refund fee charged by the exchange for the given
+ * denomination key of the refunded coin.
+ * This response is provided with HTTP status code
+ * MHD_HTTP_BAD_REQUEST.
+ */
+ TALER_EC_REFUND_FEE_TOO_LOW = 1509,
+
+ /**
+ * The exchange failed to store the refund information to
+ * its database.
+ * This response is provided with HTTP status code
+ * MHD_HTTP_INTERNAL_SERVER_ERROR.
+ */
+ TALER_EC_REFUND_STORE_DB_ERROR = 1510,
+
+ /**
+ * The refund fee is specified in a different currency
+ * than the refund amount.
+ * This response is provided with HTTP status code
+ * MHD_HTTP_BAD_REQUEST.
+ */
+ TALER_EC_REFUND_FEE_CURRENCY_MISSMATCH = 1511,
+
+ /**
+ * The refunded amount is smaller than the refund fee,
+ * which would result in a negative refund.
+ * This response is provided with HTTP status code
+ * MHD_HTTP_BAD_REQUEST.
+ */
+ TALER_EC_REFUND_FEE_ABOVE_AMOUNT = 1512,
+
+ /**
+ * The signature of the merchant is invalid.
+ * This response is provided with HTTP status code
+ * MHD_HTTP_BAD_REQUEST.
+ */
+ TALER_EC_REFUND_MERCHANT_SIGNATURE_INVALID = 1513,
+
+
+ /**
+ * The wire format specified in the "sender_account_details"
+ * is not understood or not supported by this exchange.
+ * Returned with an HTTP status code of MHD_HTTP_NOT_FOUND.
+ * (As we did not find an interpretation of the wire format.)
+ */
+ TALER_EC_ADMIN_ADD_INCOMING_WIREFORMAT_UNSUPPORTED = 1600,
+
+ /**
+ * The currency specified in the "amount" parameter is not
+ * supported by this exhange. Returned with an HTTP status
+ * code of MHD_HTTP_BAD_REQUEST.
+ */
+ TALER_EC_ADMIN_ADD_INCOMING_CURRENCY_UNSUPPORTED = 1601,
+
+ /**
+ * The exchange failed to store information about the incoming
+ * transfer in its database. This response is provided with HTTP
+ * status code MHD_HTTP_INTERNAL_SERVER_ERROR.
+ */
+ TALER_EC_ADMIN_ADD_INCOMING_DB_STORE = 1602,
+
+ /**
+ * The exchange encountered an error (that is not about not finding
+ * the wire transfer) trying to lookup a wire transfer identifier
+ * in the database. This response is provided with HTTP
+ * status code MHD_HTTP_INTERNAL_SERVER_ERROR.
+ */
+ TALER_EC_TRACK_TRANSFER_DB_FETCH_FAILED = 1700,
+
+ /**
+ * The exchange found internally inconsistent data when resolving a
+ * wire transfer identifier in the database. This response is
+ * provided with HTTP status code MHD_HTTP_INTERNAL_SERVER_ERROR.
+ */
+ TALER_EC_TRACK_TRANSFER_DB_INCONSISTENT = 1701,
+
+ /**
+ * The exchange did not find information about the specified
+ * wire transfer identifier in the database. This response is
+ * provided with HTTP status code MHD_HTTP_NOT_FOUND.
+ */
+ TALER_EC_TRACK_TRANSFER_WTID_NOT_FOUND = 1702,
+
+
+ /**
+ * The exchange found internally inconsistent fee data when
+ * resolving a transaction in the database. This
+ * response is provided with HTTP status code
+ * MHD_HTTP_INTERNAL_SERVER_ERROR.
+ */
+ TALER_EC_TRACK_TRANSACTION_DB_FEE_INCONSISTENT = 1800,
+
+ /**
+ * The exchange encountered an error (that is not about not finding
+ * the transaction) trying to lookup a transaction
+ * in the database. This response is provided with HTTP
+ * status code MHD_HTTP_INTERNAL_SERVER_ERROR.
+ */
+ TALER_EC_TRACK_TRANSACTION_DB_FETCH_FAILED = 1801,
+
+ /**
+ * The exchange did not find information about the specified
+ * transaction in the database. This response is
+ * provided with HTTP status code MHD_HTTP_NOT_FOUND.
+ */
+ TALER_EC_TRACK_TRANSACTION_NOT_FOUND = 1802,
+
+ /**
+ * The exchange failed to identify the wire transfer of the
+ * transaction (or information about the plan that it was supposed
+ * to still happen in the future). This response is provided with
+ * HTTP status code MHD_HTTP_INTERNAL_SERVER_ERROR.
+ */
+ TALER_EC_TRACK_TRANSACTION_WTID_RESOLUTION_ERROR = 1803,
+
+ /**
+ * The signature of the merchant is invalid.
+ * This response is provided with HTTP status code
+ * MHD_HTTP_BAD_REQUEST.
+ */
+ TALER_EC_TRACK_TRANSACTION_MERCHANT_SIGNATURE_INVALID = 1804,
+
+
+ /* *********** Merchant backend error codes ********* */
+
+ /**
+ * The backend could not find the merchant instance specified
+ * in the request. This response is
+ * provided with HTTP status code MHD_HTTP_NOT_FOUND.
+ */
+ TALER_EC_CONTRACT_INSTANCE_UNKNOWN = 2000,
+
+ /**
+ * The exchange failed to provide a meaningful response
+ * to a /deposit request. This response is provided
+ * with HTTP status code MHD_HTTP_SERVICE_UNAVAILABLE.
+ */
+ TALER_EC_PAY_EXCHANGE_FAILED = 2101,
+
+ /**
+ * The merchant failed to commit the exchanges' response to
+ * a /deposit request to its database. This response is provided
+ * with HTTP status code MHD_HTTP_INTERNAL_SERVER_ERROR.
+ */
+ TALER_EC_PAY_DB_STORE_PAY_ERROR = 2102,
+
+ /**
+ * The specified exchange is not supported/trusted by
+ * this merchant. This response is provided
+ * with HTTP status code MHD_HTTP_PRECONDITION_FAILED.
+ */
+ TALER_EC_PAY_EXCHANGE_REJECTED = 2103,
+
+ /**
+ * The denomination key used for payment is not listed among the
+ * denomination keys of the exchange. This response is provided
+ * with HTTP status code MHD_HTTP_BAD_REQUEST.
+ */
+ TALER_EC_PAY_DENOMINATION_KEY_NOT_FOUND = 2104,
+
+ /**
+ * The denomination key used for payment is not audited by an
+ * auditor approved by the merchant. This response is provided
+ * with HTTP status code MHD_HTTP_BAD_REQUEST.
+ */
+ TALER_EC_PAY_DENOMINATION_KEY_AUDITOR_FAILURE = 2105,
+
+ /**
+ * There was an integer overflow totaling up the amounts or
+ * deposit fees in the payment. This response is provided
+ * with HTTP status code MHD_HTTP_BAD_REQUEST.
+ */
+ TALER_EC_PAY_AMOUNT_OVERFLOW = 2106,
+
+ /**
+ * The deposit fees exceed the total value of the payment.
+ * This response is provided
+ * with HTTP status code MHD_HTTP_BAD_REQUEST.
+ */
+ TALER_EC_PAY_FEES_EXCEED_PAYMENT = 2107,
+
+ /**
+ * After considering deposit fees, the payment is insufficient
+ * to satisfy the required amount for the contract.
+ * This response is provided
+ * with HTTP status code MHD_HTTP_BAD_REQUEST.
+ */
+ TALER_EC_PAY_PAYMENT_INSUFFICIENT_DUE_TO_FEES = 2108,
+
+ /**
+ * While the merchant is happy to cover all applicable deposit fees,
+ * the payment is insufficient to satisfy the required amount for
+ * the contract. This response is provided with HTTP status code
+ * MHD_HTTP_BAD_REQUEST.
+ */
+ TALER_EC_PAY_PAYMENT_INSUFFICIENT = 2109,
+
+ /**
+ * The signature over the contract of one of the coins
+ * was invalid. This response is provided with HTTP status code
+ * MHD_HTTP_BAD_REQUEST.
+ */
+ TALER_EC_PAY_COIN_SIGNATURE_INVALID = 2110,
+
+ /**
+ * We failed to contact the exchange for the /pay request.
+ * This response is provided
+ * with HTTP status code MHD_HTTP_SERVICE_UNAVAILABLE.
+ */
+ TALER_EC_PAY_EXCHANGE_TIMEOUT = 2111,
+
+ /**
+ * The backend could not find the merchant instance specified
+ * in the request. This response is
+ * provided with HTTP status code MHD_HTTP_NOT_FOUND.
+ */
+ TALER_EC_PAY_INSTANCE_UNKNOWN = 2112,
+
+ /**
+ * The signature over the contract of the merchant
+ * was invalid. This response is provided with HTTP status code
+ * MHD_HTTP_BAD_REQUEST.
+ */
+ TALER_EC_PAY_MERCHANT_SIGNATURE_INVALID = 2113,
+
+ /**
+ * The refund deadline was after the transfer deadline.
+ * This response is provided with HTTP status code
+ * MHD_HTTP_BAD_REQUEST.
+ */
+ TALER_EC_PAY_REFUND_DEADLINE_PAST_WIRE_TRANSFER_DEADLINE = 2114,
+
+ /**
+ * The request fails to provide coins for the payment.
+ * This response is provided with HTTP status code
+ * MHD_HTTP_BAD_REQUEST.
+ */
+ TALER_EC_PAY_COINS_ARRAY_EMPTY = 2115,
+
+ /**
+ * The merchant failed to fetch the merchant's previous state with
+ * respect to a /pay request from its database. This response is
+ * provided with HTTP status code MHD_HTTP_INTERNAL_SERVER_ERROR.
+ */
+ TALER_EC_PAY_DB_FETCH_PAY_ERROR = 2116,
+
+ /**
+ * The merchant failed to fetch the merchant's previous state with
+ * respect to transactions from its database. This response is
+ * provided with HTTP status code MHD_HTTP_INTERNAL_SERVER_ERROR.
+ */
+ TALER_EC_PAY_DB_FETCH_TRANSACTION_ERROR = 2117,
+
+ /**
+ * The transaction ID was used for a conflicing transaction before.
+ * This response is
+ * provided with HTTP status code MHD_HTTP_BAD_REQUEST.
+ */
+ TALER_EC_PAY_DB_TRANSACTION_ID_CONFLICT = 2118,
+
+ /**
+ * The merchant failed to store the merchant's state with
+ * respect to the transaction in its database. This response is
+ * provided with HTTP status code MHD_HTTP_INTERNAL_SERVER_ERROR.
+ */
+ TALER_EC_PAY_DB_STORE_TRANSACTION_ERROR = 2119,
+
+ /**
+ * The exchange failed to provide a valid response to
+ * the merchant's /keys request.
+ * This response is provided
+ * with HTTP status code MHD_HTTP_SERVICE_UNAVAILABLE.
+ */
+ TALER_EC_PAY_EXCHANGE_KEYS_FAILURE = 2120,
+
+ /**
+ * The payment is too late, the offer has expired.
+ * This response is
+ * provided with HTTP status code MHD_HTTP_BAD_REQUEST.
+ */
+ TALER_EC_PAY_OFFER_EXPIRED = 2121,
+
+
+ /**
+ * Integer overflow with sepcified timestamp argument detected.
+ * This response is provided
+ * with HTTP status code MHD_HTTP_BAD_REQUEST.
+ */
+ TALER_EC_HISTORY_TIMESTAMP_OVERFLOW = 2200,
+
+ /**
+ * Failed to retrieve history from merchant database.
+ * This response is provided
+ * with HTTP status code MHD_HTTP_INTERNAL_SERVER_ERROR.
+ */
+ TALER_EC_HISTORY_DB_FETCH_ERROR = 2201,
+
+ /**
+ * We failed to contact the exchange for the /track/transaction
+ * request. This response is provided with HTTP status code
+ * MHD_HTTP_SERVICE_UNAVAILABLE.
+ */
+ TALER_EC_TRACK_TRANSACTION_EXCHANGE_TIMEOUT = 2300,
+
+ /**
+ * The backend could not find the merchant instance specified
+ * in the request. This response is
+ * provided with HTTP status code MHD_HTTP_NOT_FOUND.
+ */
+ TALER_EC_TRACK_TRANSACTION_INSTANCE_UNKNOWN = 2301,
+
+ /**
+ * The backend could not find the transaction specified
+ * in the request. This response is
+ * provided with HTTP status code MHD_HTTP_NOT_FOUND.
+ */
+ TALER_EC_TRACK_TRANSACTION_TRANSACTION_UNKNOWN = 2302,
+
+ /**
+ * The backend had a database access error trying to
+ * retrieve transaction data from its database.
+ * The response is
+ * provided with HTTP status code MHD_HTTP_INTERNAL_SERVER_ERROR.
+ */
+ TALER_EC_TRACK_TRANSACTION_DB_FETCH_TRANSACTION_ERROR = 2303,
+
+ /**
+ * The backend had a database access error trying to
+ * retrieve payment data from its database.
+ * The response is
+ * provided with HTTP status code MHD_HTTP_INTERNAL_SERVER_ERROR.
+ */
+ TALER_EC_TRACK_TRANSACTION_DB_FETCH_PAYMENT_ERROR = 2304,
+
+ /**
+ * The backend found no applicable deposits in the database.
+ * This is odd, as we know about the transaction, but not
+ * about deposits we made for the transaction. The response is
+ * provided with HTTP status code MHD_HTTP_NOT_FOUND.
+ */
+ TALER_EC_TRACK_TRANSACTION_DB_NO_DEPOSITS_ERROR = 2305,
+
+ /**
+ * We failed to obtain a wire transfer identifier for one
+ * of the coins in the transaction. The response is
+ * provided with HTTP status code MHD_HTTP_FAILED_DEPENDENCY if
+ * the exchange had a hard error, or MHD_HTTP_ACCEPTED if the
+ * exchange signaled that the transfer was in progress.
+ */
+ TALER_EC_TRACK_TRANSACTION_COIN_TRACE_ERROR = 2306,
+
+ /**
+ * We failed to obtain the full wire transfer identifier for the
+ * transfer one of the coins was aggregated into.
+ * The response is
+ * provided with HTTP status code MHD_HTTP_FAILED_DEPENDENCY.
+ */
+ TALER_EC_TRACK_TRANSACTION_WIRE_TRANSFER_TRACE_ERROR = 2307,
+
+ /**
+ * We got conflicting reports from the exhange with
+ * respect to which transfers are included in which
+ * aggregate.
+ * The response is
+ * provided with HTTP status code MHD_HTTP_FAILED_DEPENDENCY.
+ */
+ TALER_EC_TRACK_TRANSACTION_CONFLICTING_REPORTS = 2308,
+
+
+ /**
+ * We failed to contact the exchange for the /track/transfer
+ * request. This response is provided with HTTP status code
+ * MHD_HTTP_SERVICE_UNAVAILABLE.
+ */
+ TALER_EC_TRACK_TRANSFER_EXCHANGE_TIMEOUT = 2400,
+
+ /**
+ * The backend could not find the merchant instance specified
+ * in the request. This response is
+ * provided with HTTP status code MHD_HTTP_NOT_FOUND.
+ */
+ TALER_EC_TRACK_TRANSFER_INSTANCE_UNKNOWN = 2401,
+
+ /**
+ * We failed to persist coin wire transfer information in
+ * our merchant database.
+ * The response is
+ * provided with HTTP status code MHD_HTTP_INTERNAL_SERVER_ERROR.
+ */
+ TALER_EC_TRACK_TRANSFER_DB_STORE_COIN_ERROR = 2402,
+
+ /**
+ * We internally failed to execute the /track/transfer request.
+ * The response is
+ * provided with HTTP status code MHD_HTTP_INTERNAL_SERVER_ERROR.
+ */
+ TALER_EC_TRACK_TRANSFER_REQUEST_ERROR = 2403,
+
+ /**
+ * We failed to persist wire transfer information in
+ * our merchant database.
+ * The response is
+ * provided with HTTP status code MHD_HTTP_INTERNAL_SERVER_ERROR.
+ */
+ TALER_EC_TRACK_TRANSFER_DB_STORE_TRANSFER_ERROR = 2404,
+
+ /**
+ * The exchange returned an error from /track/transfer.
+ * The response is
+ * provided with HTTP status code MHD_HTTP_FAILED_DEPENDENCY.
+ */
+ TALER_EC_TRACK_TRANSFER_EXCHANGE_ERROR = 2405,
+
+ /**
+ * We failed to fetch deposit information from
+ * our merchant database.
+ * The response is
+ * provided with HTTP status code MHD_HTTP_INTERNAL_SERVER_ERROR.
+ */
+ TALER_EC_TRACK_TRANSFER_DB_FETCH_DEPOSIT_ERROR = 2406,
+
+ /**
+ * We encountered an internal logic error.
+ * The response is
+ * provided with HTTP status code MHD_HTTP_INTERNAL_SERVER_ERROR.
+ */
+ TALER_EC_TRACK_TRANSFER_DB_INTERNAL_LOGIC_ERROR = 2407,
+
+ /**
+ * The exchange gave conflicting information about a coin which has
+ * been wire transferred.
+ * The response is provided with HTTP status code MHD_HTTP_INTERNAL_SERVER_ERROR.
+ */
+ TALER_EC_TRACK_TRANSFER_CONFLICTING_REPORTS = 2408,
+
+ /**
+ * The hash provided in the request of /map/in does not match
+ * the contract sent alongside in the same request.
+ */
+ TALER_EC_MAP_IN_UNMATCHED_HASH = 2500,
+
+ /**
+ * The backend encountered an error while trying to store the
+ * pair <contract, h_proposal_data> into the database.
+ * The response is provided with HTTP status code MHD_HTTP_INTERNAL_SERVER_ERROR.
+ */
+ TALER_EC_MAP_IN_STORE_DB_ERROR = 2501,
+
+ /**
+ * The backend encountered an error while trying to retrieve the
+ * contract from database. Likely to be an internal error.
+ */
+ TALER_EC_MAP_OUT_GET_FROM_DB_ERROR = 2502,
+
+
+ /**
+ * The backend encountered an error while trying to retrieve the
+ * contract from database. Likely to be an internal error.
+ */
+ TALER_EC_MAP_OUT_CONTRACT_UNKNOWN = 2503,
+
+ /* ********** /test API error codes ************* */
+
+ /**
+ * The exchange failed to compute ECDH. This response is provided
+ * with HTTP status code MHD_HTTP_INTERNAL_SERVER_ERROR.
+ */
+ TALER_EC_TEST_ECDH_ERROR = 4000,
+
+ /**
+ * The EdDSA test signature is invalid. This response is provided
+ * with HTTP status code MHD_HTTP_BAD_REQUEST.
+ */
+ TALER_EC_TEST_EDDSA_INVALID = 4001,
+
+ /**
+ * The exchange failed to compute the EdDSA test signature. This response is provided
+ * with HTTP status code MHD_HTTP_INTERNAL_SERVER_ERROR.
+ */
+ TALER_EC_TEST_EDDSA_ERROR = 4002,
+
+ /**
+ * The exchange failed to generate an RSA key. This response is provided
+ * with HTTP status code MHD_HTTP_INTERNAL_SERVER_ERROR.
+ */
+ TALER_EC_TEST_RSA_GEN_ERROR = 4003,
+
+ /**
+ * The exchange failed to compute the public RSA key. This response
+ * is provided with HTTP status code MHD_HTTP_INTERNAL_SERVER_ERROR.
+ */
+ TALER_EC_TEST_RSA_PUB_ERROR = 4004,
+
+ /**
+ * The exchange failed to compute the RSA signature. This response
+ * is provided with HTTP status code MHD_HTTP_INTERNAL_SERVER_ERROR.
+ */
+ TALER_EC_TEST_RSA_SIGN_ERROR = 4005,
+
+
+ /**
+ * End of error code range.
+ */
+ TALER_EC_END = 9999
+ };