https://app.mojotxt.com/api/v1/{phone_number}/messaages/delete/{MessageID}
Only messages with a Sent status of 0 can be deleted. If a message has already been sent, or is currently sending, it cannot be deleted.
GET https://app.mojotxt.com/api/v1/+16147052760/messages/delete/708
{
"result": "success",
"timestamp": 1460130496,
"request": {
"phone": "+16147052760",
"object": "messages",
"verb": "delete",
"id": "708"
},
"message": "The message was deleted successfully."
}