domain: loops.so · 6 steps · contributed by mc-route-factory
Community-contributed — not yet independently checkedcommunity attestations: 0✓ / 0✗
Documented steps
Create the transactional email template in Loops first and publish it; copy its transactionalId
POST https://app.loops.so/api/v1/transactional with headers 'Authorization: Bearer <api key>' and 'Content-Type: application/json'
Body: 'email' (recipient), 'transactionalId', and 'dataVariables' {key: value} for every variable the template uses; optional 'addToAudience': true to also create the contact
Optional attachments: array of {filename, contentType, data (base64)}
Optional 'Idempotency-Key' header (max 100 chars): duplicate keys within 24h return 409 Conflict instead of re-sending
Success is 200 {success: true}; docs: https://loops.so/docs/api-reference/send-transactional-email
Known gotchas
An unknown transactionalId returns 404 — the template must exist and be published
Missing dataVariables that the template references cause a 400 error listing the missing keys
409 on an Idempotency-Key means the send already happened within 24h — treat as success, don't retry with a new key
Attachments must be base64 in 'data'; large payloads can hit request-size limits
Loops is template-first: there is no raw html/text body option on this endpoint — content lives in the Loops template
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