Merchant Support Integration Custom integration Custom integration documentation Important: To receive callback notifications after each payment, please define the URL under E-shop settings in the Portal. The previous APIv4 version (PDF) can be accessed from here. Last Updated: 1 year ago in Integration Did this article answer your question? Related Articles Click to Pay integration guide Integrate periodic Open Banking payments Integrate one-click Open Banking payments (CIT) Google Pay™ integration guide 3DS authentication in the demo environment Apple Pay integration guide