Level 3 · terminal integration and scheme approval
PaytestProbe
A probe that captures the traffic between the terminal and the host, so the content of a transaction can be examined directly.
The testing problems this solves
When a transaction fails, only the traffic reveals whether the terminal or the host is at fault. The probe sits between them and records the exchange.
What is captured
The messages sent and received, their timing and the response codes. Cross-checking them with the execution results narrows down the cause.
Where it is used
Pre-certification checks, isolating faults reproduced on site, and comparing differences in regression tests.