Claimful docs
Webhook verification
Signature verification examples and replay-window handling.
Webhook verification
Every webhook includes the header X-Claimful-Signature: t=<unix>,v1=<hex>. Verify the HMAC-SHA256 signature over timestamp.body and reject timestamps older than 300 seconds.
Fixture parity
The JavaScript, PHP, and Python snippets are tested against a shared JSON fixture so their parsing and replay-window logic stay aligned.