There are two ways that you could secure your Dropbox Fax API callback url:
- Implement Basic Auth
- This would be something like https://username:password@your.domain/callback
- Note that basic auth credentials are redacted on Fax's side
- Whitelist IPs from
- Ask support@hellosign.com for the outbound IP addresses from Fax's API
Fax
For more information about the callbacks, see the article Can you give me an example of a callback event?
See the article on sending a fax using the for more information. Fax API
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