How to provide refund RRN within the payload, once the refund has been initiated?

[ameetdesh]

RRN: retrieval reference number of refund.

This can help BAPs keep track of refund, if say customer had paid for 20kwh, but only charged 10kwh.

++ @biodatanet, @ravi-prakash-v

[ravi-prakash-v]

BPP can send the RRN inside the Payment object inside the beckn:txnRef field, along with a payment status PARTIALLY-REFUNDED in the beckn:paymentStatus field.

The BAP can listen for changes in the beckn:paymentStatus field and capture the RRN number from the beckn:txnRef field.