A service integration platform system for providing Internet services includes: an interface configured to receive a service request message that is initiated by a user of an application provided by an Independent Software Vendor (ISV), the service request message being implemented according to an Application Programming Interface (API) type and including a plurality of platform-level parameters that conform to the API type. The system further includes one or more processors coupled to the interface, configured to: locate a set of authentication checks that are appropriate for the API type, based at least in part on the plurality of platform-level parameters included in the service request message and a mapping of predefined combinations of platform-level parameters and corresponding sets of authentication checks; perform authentication of the service request according to the set of authentication checks; and route the service request to a service address of the Internet Service Provider (ISP) in the event that the service request is authenticated.