The CustomerPaymentStatusReport message is sent by a mandated agent to the previous party in the payment chain. It is used to inform this party of the positive or negative status of a file (Reporting on GroupHeader), a complete PaymentInformationblock or a transaction. It is also used to report a pending instruction.
Its use will always be governed by a bilateral agreement between the agent and the client non-financial institution.
Here are the Luxembourg implementation guidelines for the ISO 20022 XML customer payment status reporting message - "pain.002.001.03".