Fax with Make (Integromat) — Using Our REST API

How it works

Make's HTTP > Make a request module is a general-purpose caller: you set the method to POST, the URL to /v1/faxes, add an Authorization header carrying your bearer key, and give it a JSON body with a `to` number and either inline base64 or a public document_url. That single module turns any preceding module's output into a fax. For the reverse direction, the Custom webhook trigger mints a unique URL; you register it as a webhook endpoint at /dashboard/developers and subscribe it to the events you care about, and from then on our HMAC-signed posts start the scenario. Both directions are plain signed HTTP, so nothing is hosted outside Make and no code module is strictly required.

What you can do

• ✓Send a fax from any Make trigger with an HTTP > Make a request module aimed at /v1/faxes
• ✓Pass a public document_url so Make need not encode the file itself
• ✓Receive fax.delivered / fax.failed / fax.received on a Make Custom webhook
• ✓Route a delivered event onward to Google Sheets, Slack, or a CRM in the same scenario
• ✓Add an Idempotency-Key header so a scenario retry never sends the fax twice
• ✓Keep the flow connector-free using Make's standard HTTP and webhook modules

Setup steps

1. 1Confirm the account is on Business or Enterprise so the API and webhooks are live
2. 2Create an API key at /dashboard/developers with faxes:send (add faxes:read to poll)
3. 3In Make, add an HTTP > Make a request module set to POST /v1/faxes
4. 4Add an Authorization: Bearer header and a JSON body with `to` and `document_url`
5. 5For inbound automation, add a Custom webhook trigger and copy its URL
6. 6Register that webhook URL at /dashboard/developers and choose which events to forward

Example

# Make: HTTP > Make a request
Method:  POST
URL:     https://www.sendfaxmail.com/v1/faxes
Headers: Authorization: Bearer sfm_live_xxxxxxxx
         Idempotency-Key: {{executionId}}
Body (JSON):
{ "to": "{{1.fax_number}}", "document_url": "{{1.file_url}}" }

Make (Integromat) — FAQ