Here is a list of all documented files with brief descriptions:

a_rvp_php_sdk_data_object.class.php
a_rvp_php_sdk_object.class.php
a_rvp_php_sdk_security_object.class.php
common.php
en.php
rvp_php_sdk.class.php
rvp_php_sdk_login.class.php
rvp_php_sdk_place.class.php
rvp_php_sdk_thing.class.php
rvp_php_sdk_user.class.php