Getting started with Developer's SMS API
The first thing that you need to do is to create an account, then please contact us so that we can activate the API for you. This process is very quick, and we can usually have everything ready within the hour.
A full description of the parameters that you need to set when you call the API may be found at the HTTP API page, or alternatively have a look at our downloadable 
Integration guide
Links to examples of how to implement the API in particular languages are shown below:
All new accounts come with 10 free credits for you to use as you wish. Also, the API supports a 'test mode' setting which allows you to exercise the interface without actually sending any text messages. This means that you don't have to use your trial messages until you are ready.