1.7. Taler Bank API

This chapter describe the APIs that banks need to offer towards Taler wallets to tightly integrate with GNU Taler.

1.7.1. Withdrawing

Withdrawals with a Taler-integrated bank are based on withdrawal operations. Some user interaction (on the Bank’s website or a Taler-enabled ATM) creates a withdrawal operation record in the Bank’s database. The wallet can use a unique identifier for the withdrawal operation (the wopid) to interact with the withdrawal operation.

GET ${BANK_API_BASE_URL}/withdrawal-operation/${wopid}

Query information about a withdrawal operation, identified by the wopid.

Request

Query Parameters
  • long_poll_ms – Optional. If specified, the bank will wait up to long_poll_ms milliseconds for completion of the transfer before sending the HTTP response. A client must never rely on this behavior, as the bank may return a response immediately.

Response

Status Codes
export class BankWithdrawalOperationStatus {
  // has the wallet selected parameters for the withdrawal operation
  // (exchange and reserve public key) and successfully sent it
  // to the bank?
  selection_done: boolean;

  // The transfer has been confirmed and registered by the bank.
  // Does not guarantee that the funds have arrived at the exchange already.
  transfer_done: boolean;

  // Amount that will be withdrawn with this operation
  // (raw amount without fee considerations).
  amount: Amount;

  // Bank account of the customer that is withdrawing, as a
  // payto URI.
  sender_wire?: string;

  // Suggestion for an exchange given by the bank.
  suggested_exchange?: string;

  // URL that the user needs to navigate to in order to
  // complete some final confirmation (e.g. 2FA).
  confirm_transfer_url?: string;

  // Wire transfer types supported by the bank.
  wire_types: string[];
}
POST ${BANK_API_BASE_URL}/withdrawal-operation/${wopid}

Request The body of this request must have the format of a BankWithdrawalOperationPostRequest.

Response

Status Codes

Details

interface BankWithdrawalOperationPostRequest {

  // Reserve public key.
  reserve_pub: string;

  // Exchange bank details specified in the 'payto'
  // format.  NOTE: this field is optional, therefore
  // the bank will initiate the withdrawal with the
  // default exchange, if not given.
  exchange_wire_details: string;
}

interface BankWithdrawalOperationPostResponse {

  // The transfer has been confirmed and registered by the bank.
  // Does not guarantee that the funds have arrived at the exchange already.
  transfer_done: boolean;

  // URL that the user needs to navigate to in order to
  // complete some final confirmation (e.g. 2FA).
  //
  // Only applicable when 'transfer_done' is false.
  confirm_transfer_url?: string;
}

1.7.2. Testing APIs

The following APIs are exposed by some bank API implementations for testing as part of the wallet’s integration tests.

Warning

These APIs must not be offered by any production systems.

POST ${BANK_API_BASE_URL}/testing/register
POST ${BANK_API_BASE_URL}/testing/withdraw
POST ${BANK_API_BASE_URL}/testing/withdraw-uri