We recently upgraded from LTS 4.6 to 5.3.1 (in July). Via the GUI we can see the Payment Method that we'd like to import -> Moneris -> id=6
Importing with Payment Method:
- Moneris -> fails: Reason: Payment Instrument is not valid: Moneris
- 6 -> fails: Reason: Payment Instrument is not valid: 6
What else can I try?