PaymentKits guide · 6 min read
Debug webhooks without copying production data
A practical workflow for reproducing signatures, ordering and retries with synthetic fixtures.
Start with the event contract
Write down the event name, header format, body shape and expected response. Build a small synthetic fixture that resembles the contract but has no customer, card or account information.
Verify the exact bytes
Most signature failures are caused by a body being parsed, re-serialized or altered before verification. Capture the raw test payload, then check the provider's timestamp and signature recipe against it.
Exercise outcome states
Send success, retry and out-of-order fixtures through your handler. A reliable webhook consumer can safely handle duplication, delayed delivery and a non-2xx response without guessing.