Webhook subscriptions
Outbound, signed webhooks — subscribe, test, inspect deliveries, redeliver.
Base URL https://app.upfour.io/v1. Send your key as
Authorization: Bearer <key>;
every key acts on your real Company, so
test without paging anyone.
New here? Start with the quickstart.
The examples read the key from UP4_API_KEY.
Everyday
Deliveries
Control
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