Refresh token support for multi-authorization on Single Instant Payments
TPPs can now use the refresh token issued at initial authorization to submit a Single Instant Payment after all authorizers complete.
Added refresh token support to the Single Instant Payment flow when used under Multi-Authorization.
Previously, the access token issued at initial authorization expired after 10 minutes. In a multi-authorization journey the final authorizer can act much later than this, so by the time the consent reached Status=Authorized the TPP no longer held a valid access token to call POST /payments. This effectively blocked Single Instant Payments from being used with multi-authorization consents.
TPPs can now use the refresh token issued at initial authorization to obtain a fresh access token and submit the payment once all authorizers have completed their step.
