Payment Initiation Services (PIS)

Payment Initiation Services (PIS)

What is PIS

Under PSD2, a ‘payment initiation service’ is an online service which accesses a user’s payment account to initiate the transfer of funds on their behalf with the user’s consent and authentication. Payment initiation services provide an alternative to paying online using a credit card or debit card.

API endpoints

Link Resource Endpoints
SEPA Payment domestic-payments

POST /{payment-product}

GET /{payment-product}/{paymentId}
GET /{payment-product}/{paymentId}/status

How does it work?

UBB has decided to develop its APIs according to the BISTRA standard. Terminology used is therefore via this standard.

Step 1: Agree Payment-Order Initiation

  • The process begins with a PSU consenting to a payment being made
  • The consent is between the PSU and the PISP
  • The debtor account details can optionally be specified at this stage

Step 2: Setup Payment-Order Consent

  • The AISP connects to UBB’s API Gateway and creates a payment-order consent resource
  • This informs UBB that one of its PSUs intends to make a payment-order
  • UBB responds with an identifier for the payment-order consent resource, the PaymentId, which is the intent identifier
  • This step is carried out by making a POST request to the payment-order consent resource

Step 3: Consent

  • The PISP requests the PSU to give its consent to authorise the PISP to initiate a payment transaction from the designated payment account
  • The PISP redirects the PSU to the ASPSP
  • The redirect includes the PaymentId generated in the previous step
  • This allows UBB to correlate the payment order consent that was setup
  • UBB authenticates the PSU
  • The PSU selects the debtor account at this stage, if not previously specified
  • UBB updates the state of the payment order consent resource internally to indicate that the consent has been authorised
  • Once the consent has been authorised, the PSU is redirected back to the PISP

Step 4: Get Payment-Order/Consent Status

  • The PISP can check the status of the payment-order consent with the ConsentId or payment-order resource with the payment-order resource identifier
  • This is carried out by making a GET request to the payment-order consent or payment-order resource
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