Handling payment webhooks sounds straightforward—until network retries hit your server three times in a row, or an attacker intercepts a valid payload and tries to credit their balance twice. Validating signatures is step one, but it won't protect you from a replay attack where a valid, signed p...
Source: [Dev.to](https://dev.to/doaaa_04/how-i-stop-webhook-replay-attacks-in-nodejs-postgresql-24m6)