taler-docs

post-batch-deposit.rst (14012B)

---

 .. http:post:: /batch-deposit
 
   Deposit multiple coins and ask the exchange to transfer the given :ref:`amount`
   into the merchant's bank account.  This API is used by the merchant to redeem
   the digital coins.
 
   **Request:**
 
   The request body must be a `BatchDepositRequest` object.
 
   **Response:**
 
   :http:statuscode:`200 OK`:
     The operation succeeded, the exchange confirms that no double-spending took
     place.  The response will include a `DepositSuccess` object.
   :http:statuscode:`403 Forbidden`:
     One of the signatures is invalid.
     This response comes with a standard `ErrorDetail` response.
   :http:statuscode:`404 Not found`:
     Either one of the denomination keys is not recognized (expired or invalid),
     or the wire type is not recognized.
     If a denomination key is unknown, the response will be
     a `DenominationUnknownMessage`.
   :http:statuscode:`409 Conflict`:
     The deposit operation has either failed because a coin has insufficient
     residual value, or because the same public key of a coin has been
     previously used with a different denomination.
     Which case it is can be decided by looking at the error code:
 
     1. ``TALER_EC_EXCHANGE_DEPOSIT_CONFLICTING_CONTRACT`` (same coin used in different ways),
     2. ``TALER_EC_EXCHANGE_GENERIC_INSUFFICIENT_FUNDS`` (balance insufficient),
     3. ``TALER_EC_EXCHANGE_GENERIC_COIN_CONFLICTING_DENOMINATION_KEY`` (same coin public key, but different denomination).
     4. ``TALER_EC_EXCHANGE_GENERIC_COIN_CONFLICTING_AGE_HASH`` (same coin public key, but different age commitment).
 
     The request should not be repeated again with this coin.  Instead, the client
     can get from the exchange via the ``/coin/$COIN_PUB/history`` endpoint the record
     of the transactions known for this coin's public key.
   :http:statuscode:`410 Gone`:
     The requested denomination key is not yet or no longer valid.
     It either before the validity start, past the expiration or was revoked. The response is a
     `DenominationGoneMessage`. Clients must evaluate
     the error code provided to understand which of the
     cases this is and handle it accordingly.
   :http:statuscode:`451 Unavailable For Legal Reasons`:
     This merchant has not yet passed the KYC checks.
     The client must pass KYC checks before proceeding with the deposit.
     The response will be an `LegitimizationNeededResponse` object.
     @since protocol **v21**.
 
   **Details:**
 
   .. ts:def:: BatchDepositRequest
 
     interface BatchDepositRequest {
 
       // The merchant's account details as a full payto URI.
       merchant_payto_uri: string;
 
       // The salt is used to hide the ``payto_uri`` from customers
       // when computing the ``h_wire`` of the merchant.
       wire_salt: WireSalt;
 
       // SHA-512 hash of the contract of the merchant with the customer.  Further
       // details are never disclosed to the exchange.
       h_contract_terms: HashCode;
 
       // Merchant's signature over the h_contract_terms.
       // @since protocol **v22**
       merchant_sig: EddsaSignature;
 
       // The list of coins that are going to be deposited with this Request.
       coins: BatchDepositRequestCoin[];
 
       // Timestamp when the contract was finalized.
       timestamp: Timestamp;
 
       // Indicative time by which the exchange undertakes to transfer the funds to
       // the merchant, in case of successful payment. A wire transfer deadline of 'never'
       // is not allowed.
       wire_transfer_deadline: Timestamp;
 
       // EdDSA `public key of the merchant <merchant-pub>`, so that the client can identify the
       // merchant for refund requests.
       merchant_pub: EddsaPublicKey;
 
       // Additional text to include in the wire transfer subject when
       // settling the payment. Note that the merchant MUST use this
       // consistently for the same ``merchant_pub`` and ``merchant_payto_uri``
       // as during aggregation *any* of these values may be selected
       // for the actual aggregated wire transfer. If a merchant wants
       // to use different ``extra_subject`` values for the same IBAN,
       // it should thus create multiple instances (with different
       // ``merchant_pub`` values). When changing the ``extra_subject``,
       // the change may thus not be immediately reflected in the
       // settlements.
       //
       // Must match [a-zA-Z0-9-.:]{1, 40}
       //
       // Optional. Since **v32**.
       extra_wire_subject_metadata?: string;
 
       // Date until which the merchant can issue a refund to the customer via the
       // exchange, to be omitted if refunds are not allowed.
       //
       // THIS FIELD WILL BE DEPRICATED, once the refund mechanism becomes a
       // policy via extension.
       refund_deadline?: Timestamp;
 
       // CAVEAT: THIS IS WORK IN PROGRESS
       // (Optional) policy for the batch-deposit.
       // This might be a refund, auction or escrow policy.
       policy?: DepositPolicy;
     }
 
   .. ts:def:: BatchDepositRequestCoin
 
     interface BatchDepositRequestCoin {
       // EdDSA public key of the coin being deposited.
       coin_pub: EddsaPublicKey;
 
       // Hash of denomination RSA key with which the coin is signed.
       denom_pub_hash: HashCode;
 
       // Exchange's unblinded RSA signature of the coin.
       ub_sig: DenominationSignature;
 
       // Amount to be deposited, can be a fraction of the
       // coin's total value.
       contribution: Amount;
 
       // Signature over `TALER_DepositRequestPS`, made by the customer with the
       // `coin's private key <coin-priv>`.
       coin_sig: EddsaSignature;
     }
 
   .. ts:def:: DenominationSignature
 
     type DenominationSignature = DenomCipher & (
       | RsaDenominationSignature
       | CSDenominationSignature
     );
 
   .. ts:def:: RsaDenominationSignature
 
     interface RsaDenominationSignature extends DenomCipher {
       cipher: "RSA";
 
       // RSA signature
       rsa_signature: RsaSignature;
     }
 
   .. ts:def:: CSDenominationSignature
 
     interface CSDenominationSignature extends DenomCipher {
       cipher: "CS";
 
       // R value component of the signature.
       cs_signature_r: Cs25519Point;
 
       // s value component of the signature.
       cs_signature_s: Cs25519Scalar;
 
     }
 
   .. ts:def:: DepositPolicy
 
     type DepositPolicy =
     | PolicyMerchantRefund
     | PolicyBrandtVickreyAuction
     | PolicyEscrowedPayment;
 
   .. ts:def:: PolicyMerchantRefund
 
     // CAVEAT: THIS IS STILL WORK IN PROGRESS.
     // This policy is optional and might not be supported by the exchange.
     // If it does, the exchange MUST show support for this policy in the
     // ``extensions`` field in the response to ``/keys``.
     interface PolicyMerchantRefund {
       type: "merchant_refund";
 
       // EdDSA `public key of the merchant <merchant-pub>`, so that the client
       // can identify the merchant for refund requests.
       merchant_pub: EddsaPublicKey;
 
       // Date until which the merchant can issue a refund to the customer via
       // the ``/extensions/policy_refund``-endpoint of the exchange.
       deadline: Timestamp;
     }
 
   .. ts:def:: PolicyBrandtVickreyAuction
 
     // CAVEAT: THIS IS STILL WORK IN PROGRESS.
     // This policy is optional and might not be supported by the exchange.
     // If it does, the exchange MUST show support for this policy in the
     // ``extensions`` field in the response to ``/keys``.
     interface PolicyBrandtVickreyAuction {
       type: "brandt_vickrey_auction";
 
       // Public key of this bidder.
       //
       // The bidder uses this key to sign the auction information and
       // the messages it sends to the seller during the auction.
       bidder_pub: EddsaPublicKey;
 
       // Hash of the auction terms
       //
       // The hash should be taken over a normalized JSON object of type
       // `BrandtVickreyAuction`.
       h_auction: HashCode;
 
       // The amount that this bidder commits to for this auction
       //
       // This amount can be larger than the contribution of a single coin.
       // The bidder can increase funding of this auction policy by using
       // sufficiently many coins during the deposit operation (single or batch)
       // with the same policy.
       commitment: Amount;
 
       // Date until the auction must have been successfully executed and
       // a valid transcript provided to the
       // ``/extensions/policy_brandt_vickrey_auction``-endpoint of the
       // exchange.
       //
       // [If the auction has not been executed by then] OR [has been executed
       // before then, but this bidder did not win], the coin's value doesn't
       // change and the owner can refresh the coin.
       //
       // If this bidder won the auction, the winning price/amount from the
       // outcome will be substracted from the coin and transfered to the
       // merchant's ``payout_uri`` from the deposit request (minus a potential
       // auction fee).  For any remaining value, the bidder can refresh the
       // coin to retrieve change.
       deadline: Timestamp;
     }
 
   .. ts:def:: BrandtVickreyAuction
 
     // CAVEAT: THIS IS STILL WORK IN PROGRESS.
     // This structure defines an auction of Brandt-Vickory kind.
     // It is used for the `PolicyBrandtVickreyAuction`.
     interface BrandtVickreyAuction {
       // Start date of the auction
       time_start: Timestamp;
 
       // Maximum duration per round.  There are four rounds in an auction of
       // Brandt-Vickrey kind.
       time_round: RelativeTime;
 
       // This integer m refers to the (m+1)-type of the Brandt-Vickrey-auction.
       // - Type 0 refers to an auction with one highest-price winner,
       // - Type 1 refers to an auction with one winner, paying the second
       //   highest price,
       // - Type 2 refers to an auction with two winners, paying
       //   the third-highest price,
       // - etc.
       auction_type: Integer;
 
       // The vector of prices for the Brandt-Vickrey auction.  The values MUST
       // be in strictly increasing order.
       prices: Amount[];
 
       // The type of outcome of the auction.
       // In case the auction is declared public, each bidder can calculate the
       // winning price.  This field is not relevant for the replay of a
       // transcript, as the transcript must be provided by the seller who sees
       // the winner(s) and winning price of the auction.
       outcome_public: boolean;
 
       // The public key of the seller.
       pubkey: EddsaPublicKey;
 
       // The seller's account details as a full payto URI.
       payto_uri: string;
     }
 
 
   .. ts:def:: PolicyEscrowedPayment
 
     // CAVEAT: THIS IS STILL WORK IN PROGRESS
     // This policy is optional and might not be supported by the exchange.
     // If it does, the exchange MUST show support for this policy in the
     // ``extensions`` field in the response to ``/keys``.
     interface PolicyEscrowedPayment {
       type: "escrowed_payment";
 
       // Public key of this trustor, the owner of the coins.
       //
       // To claim the deposit, the merchant must provide the valid signature
       // of the ``h_contract_terms`` field from the deposit, signed by _this_
       // key, to the ``/extensions/policy_escrow``-endpoint of the exchange,
       // after the date specified in ``not_before`` and before the date
       // specified in ``not_after``.
       trustor_pub: EddsaPublicKey;
 
       // Latest date by which the deposit must be claimed.  If the deposit
       // has not been claimed by that date, the deposited coins can be
       // refreshed by the (still) owner.
       deadline: Timestamp;
     }
 
   The deposit operation succeeds if the coin is valid for making a deposit and
   has enough residual value that has not already been deposited or melted.
 
   .. ts:def:: DepositSuccessResponse
 
      interface DepositSuccessResponse {
       // Optional base URL of the exchange for looking up wire transfers
       // associated with this transaction.  If not given,
       // the base URL is the same as the one used for this request.
       // Can be used if the base URL for ``/transactions/`` differs from that
       // for ``/coins/``, i.e. for load balancing.  Clients SHOULD
       // respect the ``transaction_base_url`` if provided.  Any HTTP server
       // belonging to an exchange MUST generate a 307 or 308 redirection
       // to the correct base URL should a client uses the wrong base
       // URL, or if the base URL has changed since the deposit.
       transaction_base_url?: string;
 
       // Total amount deposited so far under this contract terms for
       // this merchant.
       // Since **v33**.
       accumulated_total_without_fee: Amount;
 
       // Timestamp when the deposit was received by the exchange.
       exchange_timestamp: Timestamp;
 
       // `Public EdDSA key of the exchange <sign-key-pub>` that was used to
       // generate the signature.
       // Should match one of the exchange's signing keys from ``/keys``.  It is given
       // explicitly as the client might otherwise be confused by clock skew as to
       // which signing key was used.
       exchange_pub: EddsaPublicKey;
 
       // Deposit confirmation signature from the exchange.
       // The EdDSA signature of `TALER_DepositConfirmationPS` using a current
       // `signing key of the exchange <sign-key-priv>` affirming the successful
       // deposit and that the exchange will transfer the funds after the refund
       // deadline, or as soon as possible if the refund deadline is zero.
       exchange_sig: EddsaSignature;
     }
 
   .. ts:def:: DepositDoubleSpendError
 
     interface DepositDoubleSpendError {
 
       // Must be TALER_EC_EXCHANGE_GENERIC_INSUFFICIENT_FUNDS
       // or TALER_EC_EXCHANGE_GENERIC_COIN_CONFLICTING_DENOMINATION_KEY
       code: Integer;
 
       // A string explaining that the user tried to
       // double-spend.
       hint: string;
 
       // EdDSA public key of a coin being double-spent.
       coin_pub: EddsaPublicKey;
 
       // Hash of the public key of the denomination of the coin.
       h_denom_pub: HashCode;
 
     }