Although, this API is supported, we suggest using a more modern and feature-rich Omnichannel API for sending SMS messages.
You can also receive SMS sent to virtual numbers to your application with Messente API
Messente makes a HTTP GET request to your service when SMS is received from the handset.In order to get an Inbound Number, please contact us.
Messente has HTTP API libraries for various languages including PHP, Python, Java and C#. Check out the Messente Libraries section in our documentation.
Always make sure to secure your DLR endpoint URL as stated in our Security section and return HTTP 200 response code.