Message type: E = Error
Message class:  SLS_PAYSP - Payment Service Provider Integration 
Message number: 013
Message text: Payment by payment service provider (PSP); but no PSP ID found
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The SAP error message SLS_PAYSP013 indicates that there is an issue with the payment processing through a Payment Service Provider (PSP). Specifically, the error states that a payment is being attempted via a PSP, but the system cannot find a corresponding PSP ID in the configuration. This can occur in various scenarios, such as during the payment processing of an invoice or when attempting to execute a payment run.
Cause: Missing PSP Configuration: The most common cause of this error is that the PSP ID has not been configured in the SAP system. This could be due to a missing entry in the relevant configuration tables or settings. Incorrect PSP ID: The PSP ID being referenced in the payment processing might be incorrect or not properly linked to the payment method being used. Integration Issues: There may be issues with the integration between SAP and the PSP, such as incorrect API configurations or missing
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