Sending Commands
A Programmable Fax API command is sent with a fax_id. The fax_id allows a user to communicate to Telnyx the fax the user wants to take an action on.
The Telnys Programmable Fax API supports PDF files. To initiate sending the fax, we need to send the request to the Telnyx Programmable Fax API endpoint https://api.telnyx.com/v2/faxes.
Authentication
With the request we need to send additional parameters containing authentication information so Telnyx knows which account to send the fax from and information about the destination and file being sent.
| HEADER | DESCRIPTION |
| media_url | Authorization: Bearer YOUR_API_KEY |
| connection_id | Authorization: Bearer YOUR_API_KEY |
| to | Authorization: Bearer YOUR_API_KEY |
| from | Authorization: Bearer YOUR_API_KEY |
| Authorization: Bearer | The prefix to your API V2 key created in Step 2. |
Available commands and their expected Webhooks
Telnyx sends webhooks to update on the status of Programmable Fax. Webhooks will also be sent in response to requests to list and delete faxes.
| COMMAND | ASSOCIATED WEBHOOKS |
| Send a fax | fax.queued fax.media.processed fax.sending.started fax.delivered fax.failed |
Response when sending command
When you send a Programmable Fax API Command, you will immediately receive an http response. Responses include, but are not limited to:
| HTTP STATUS CODE | MESSAGE | DESCRIPTION |
| 202 | OK | The request succeeded. |
| 403 | Forbidden | The request was valid, however the user is not authorized to perform this action. |
| 404 | Not Found | The requested resource could not be found. |
| 422 | Invalid Parameters | The request has invalid parameters. |
Example: Sending commands
To send a fax, send a POST request to the https://api.telnyx.com/v2/faxes endpoint as shown in the example below.
WITH A API V2 KEY
curl -X POST https://api.telnyx.com/v2/faxes \
--data-urlencode "media_url=https://www.w3.org/WAI/ER/tests/xhtml/testfiles/resources/pdf/dummy.pdf" \
--data-urlencode "connection_id=1232154810234" \
--data-urlencode "to=+13129457420" \
--data-urlencode "from=+19459457421" \
--header "Authorization: Bearer APIAuthKey_fromPortal"
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