Automatic OAuth2 Authentication
If your HTTP client supports OAuth2 authentication natively, you only have to configure the authentication parameters according to the above table.
By configuring the above parameters, you have just to perform the rest API calls (View your Balance, Send SMS etc.). Your Oauth2 capable HTTP client will perform the authentication automatically for you before the first API request. If the Authentication is successful, SMS API will return an Access Token associated with a Validity Period in seconds. This Access Token for as long as is still valid (according to Validity Period), allows you to access all SMS API operations described in the current documentation without the need to perform subsequent authentications for each API call you perform.
Your OAuth2 capable HTTP client will perform a new Authentication for you (and it will fetch a new Access Token with an updated Validity Period) just before the first API call that will be executed after the Validity Period of the Access Token expires.