Process OAuth2 authorization callback from account holder

Handles OAuth2 authorization callback responses from account holder institutions after user consent. Processes authorization codes, ID tokens, and state parameters to complete the consent flow for payment initiation (PAYMENTS_V4), automatic payments (AUTOMATIC_PAYMENTS_V2), or enrollment-based payments (ENROLLMENTS_V2). This endpoint is called by the account holder after the user authorizes or rejects the consent request.

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