Set the parameter mms_url on your MMS-enabled Virtual Phone Number to https://yourapp.io/elks/mms (or wherever your webhook code is). We'll make an HTTP POST (application/x-www-form-urlencoded) request to this URL every time your number receives an MMS.
direction=incoming& id=sf8425555e5d8db61dda7a7b3f1b91bdb& from=%2B46706861004&to=%2B46706861020& created=2018-07-13T13%3A57%3A23.741000& message=Hello%20how%20are%20you%3F& image=https%3A%2F%2Fapi.46elks.com%2Fa1%2F
|id||The unique id of the message in our systems.|
|from||The sender of the MMS.|
|to||The phone number the MMS was sent to.|
|message||The message included with the MMS.|
|images||A list of URLs pointing to the MMS image(s). Only present if an image was sent.|
|created||The time in UTC when the MMS object was created in our systems.|
Your webhook code must respond with a HTTP status in the range 200-204. If not, the API will consider the request failed and keep trying for up to 24 hours.