We have implemented integration with PayPal using REST API which is currently in LIVE. The implementation assumption to distinguish transaction id and payment id was the fact that reference contains 'PAY-' prefix, however we discovered that sometimes we are getting payment ids with prefix 'PAYID-', which is causing refund failure at Live. At this point we need to understand what are the possible payment prefixes and what is the difference between payment with different prefixes \dependency how to achieve specific prefix for the payment. Could we , please, get this information as we didn't manage to find this on the PayPal API description?
