Changelog

Every change to the API, newest first. v1 changes only add things, so code written for an earlier version keeps working. See versioning.

1.1.0 · 2026-10-08

Templates, custom fields, opt-out writes, estimates, weekly repeats, inbox, reports and campaign controls.

Added

• POST /api/v1/templates
• GET /api/v1/templates/{template_id}
• PATCH /api/v1/templates/{template_id}
• DELETE /api/v1/templates/{template_id}
• GET /api/v1/custom-fields
• POST /api/v1/custom-fields
• PATCH /api/v1/custom-fields/{field_id}
• DELETE /api/v1/custom-fields/{field_id}
• GET /api/v1/members/{member_id}/custom-fields
• PATCH /api/v1/members/{member_id}/custom-fields
• POST /api/v1/opt-outs
• POST /api/v1/opt-outs/bulk
• POST /api/v1/recipients/validate
• POST /api/v1/messages/estimate
• GET /api/v1/inbox
• GET /api/v1/inbox/unread-count
• POST /api/v1/inbox/{message_id}/read
• POST /api/v1/inbox/read-all
• GET /api/v1/messages/{message_id}/deliveries
• GET /api/v1/analytics
• GET /api/v1/campaigns
• GET /api/v1/campaigns/{campaign_id}
• POST /api/v1/campaigns/{campaign_id}/pause
• POST /api/v1/campaigns/{campaign_id}/resume
• POST /api/v1/campaigns/{campaign_id}/cancel

Changed

• POST /api/v1/messages accepts template_id instead of text, and repeat for weekly sends.
• GET /api/v1/scheduled items include repeat.
• Bulk opt-outs, recipient checks, delivery reports and analytics share a 10 per minute limit per key.
• member.opted_out is also sent when your integration records an opt-out.

1.0.0 · 2026-10-08

First release: team, members, groups, messages, scheduled messages, templates, opt-outs, inbound messages and webhooks.

The machine-readable description is /api/v1/openapi.json, and a Postman collection is built from it.