Fax API for sending and tracking faxes
Add fax sending to an application or internal workflow. Upload a PDF, submit it to a verified recipient fax number, and use the job reference to check what happened.
Upload the document and submit a job
Create a document record, upload the PDF using the returned URL, and complete the upload. Submit a fax job using the document reference and an idempotency key. Keep the returned job reference with your workflow record so you can check its status if the reply or delivery outcome is unclear.
Track delivery in your application
Read the fax job status or subscribe to delivery webhooks. Verify webhook signatures before processing events. Wait for positive delivery confirmation before marking a fax delivered in your application.
Start with the API reference
The API reference includes authentication, document uploads, fax job examples, and webhook verification. Start with an example before making a live request.