How do I know if a fax transmission through the API succeeded?
When you are sending a fax message through the FaxOut API, you can check the status of this transmission. Outgoing faxes pass through several workflow phases, so when you have just sent an API request message status will be “Queued” (this status is returned in the FaxOut API response). After some time (usually within couple of minutes) the status of the fax message will be changed to either “Sent” (which means that message was sent successfully) or to “Sending Failed”. You can call the Get Message or the Get Message List API to check the status of a particular message.