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Webhook events

What PayPal and Channel3 sent, whether it was verified, and what it changed.

PayPal events are verified with PayPal; Channel3 events by their signature. A repeated event is handled once.

How events are verified

PayPal events are checked with PayPal's verify-webhook-signature call; Channel3 events with their signing secret (HMAC-SHA256). A repeated event ID is acknowledged and handled once.