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The Payment Services Directive 2 (PSD2) regulates online payment services and providers in Europe and enables open banking by introducing Access to Account (XS2A). XS2A allows customers to use the services of third-party providers to access account information or initiate transactions on their behalf. PSD2 gives providers a regulated, open market to compete in, while providing customers more payment options and increased security.

If what you are looking for are the Satispay Business API, they can be found here.