how to use BxDolService

can you tell me where I can find information on how to use BxDolService?

Service calls to modules' methods.

The class has one static method is needed to make service calls

to module's methods from the Dolphin's core or the other modules.

Example of usage:

BxDolService::call('payment', 'get_add_to_cart_link', array($iVendorId, $mixedModuleId, $iItemId, $iItemCount));