Developing without live data.
WHY A SANDBOX MATTERS
Callers cannot develop against live customers, money or messages.
WHAT IT SHOULD PROVIDE
The same interface Separate credentials Data that can be created and destroyed freely Predictable ways to trigger errors
WHY THAT LAST POINT MATTERS MOST
Testing failure handling requires a way to cause failures.
WHAT TO PROVIDE
Specific values that produce specific errors.
WHAT PAYMENT PROVIDERS DO
Test card numbers producing declines, timeouts and disputes.
WHY THAT IS THE MODEL TO COPY
It lets callers test everything that matters.
WHAT TO DOCUMENT
Every such trigger.
WHAT TO KEEP ALIGNED
Sandbox behaviour with production.
WHY
Divergence means code that works in testing fails live.
WHAT COMMONLY DIVERGES
Rate limits Validation strictness Response timing Which features exist
WHAT TO STATE CLEARLY
Any known difference.
WHAT TO NEVER DO
Let sandbox credentials work against production, or the reverse.
HOW TO PREVENT IT
Visibly different credential formats.
WHY
It makes the mistake obvious rather than silent.
WHAT TO PROVIDE FOR WEBHOOK TESTING
A way to trigger events on demand.
