[iPay88] What does the «Payment Not Allow» API response mean?

The technical specification does not describe the «Payment Not Allow» response, but it describes some similar responses:

• «Payment not allowed»
• «Permission not allow»

So I recommend:

1. Check solutions for these similar responses.

• If the step 1 does not help, then ask the iPay88 technical support what does the «Payment Not Allow» response mean.