If the Membership No. is Not Assigned at the Account or Contact Level then check:
- The Batch Processor on the Merchant Facility is Started
- The picklist field "Override Target Contact Values" on Merchant Facility is set to "Yes"
- Check the user processing the records or the one that started the Batch Processor has a Payments2Us Permission Set assigned.
- Check the Error Log - Payments2Us Tab to see if there are any errors recorded.
- Check the Payment Txn, field Status. This should be at "Matching Complete".
Also check the Payment Txn related field history for Status and Confirm that it has not been changed directly to Matching Complete. The prior Status should be "Payment Complete" or "Receipting Complete".