Breaking

• payload.amount (decimal string) replaced by payload.amountCents (integer minor units).
• The signature header now sends only v1=; the v0= compatibility value is gone.
• payload must be a non-empty object. Publishing {} returns 422 empty_payload.

Added

• streamKey for opt-in ordered delivery.
• apiVersion on every delivered event body.
• status and since filters on GET /v1/deliveries.

See Migrating to v2.

• Bulk replay endpoint (POST /v1/subscriptions/:id/replay).
• Per-subscription metrics endpoint with a 1h/24h/7d window.
• Sydney region (ap-southeast-2) opened.

• Retry attempts raised from 3 to 5, and the backoff cap from 16s to 32s.
• Consecutive-failure disable threshold raised from 10 to 20.
• Signing-secret rotation now keeps the previous secret valid for 24 hours.

First generally available version.

• POST /v1/events, GET /v1/events, subscription CRUD.
• HMAC-SHA256 request signing.
• US and EU regions.