The mNotify Voice SMS API is similar to the SMS API with the difference in the content you are dealing with. Instead of sending message, you are going to send voice and an optional parameter for message indicating missed call message.
The core requirement or parameter needed for this integration is your generated API Key. Recall that the API Key is a random generated string in an alphanumeric format such as this:
When your API Key is set, you can now start your integration. Good luck and have fun in your integration!!!