It's tempting to integrate Verification of Payee, see a match come back, and call it done. But the value of VoP is in the moments when the answer isn't a clean match — and those are exactly the cases a quick test skips. A proper sandbox plan covers them all.
Test every outcome
A sandbox should let you reproduce each scheme outcome on demand, usually by sending specific test names or IBANs. Make sure your UI and your code do the right thing for each one.
- Match (MTCH) — confirm the payment can proceed cleanly.
- Close match (CMTC) — confirm you surface the suggested verified name to confirm or correct.
- No match (NMTC) — confirm you show a clear warning and don't auto-proceed.
- Not applicable (NOAP) — confirm you handle 'couldn't verify' gracefully, not as an error.
Don't forget the error paths
Beyond the four outcomes, test what happens with a malformed IBAN, a missing payee name, an expired credential and a timeout. These are where fragile integrations break in production.
Keep tests deterministic
Use a sandbox with documented, deterministic test data so a given input always returns the same outcome. That makes your integration tests repeatable in CI and means a failure points to a real regression, not a flaky responder.
From sandbox to production
Once every outcome and error path behaves correctly, going live is usually just switching the base URL and credentials. RoxPay provides a sandbox with test cases for each outcome, so you can validate the full flow before pointing at production.