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IExternalService.GetServiceId

Method
Description:
Implement this method to return the unique Id of the service.
Remarks:

For all built-in external services, their Ids are all items of the enumerated type ExternalServices.BuiltInExternalServices.

Third-party services will have their respective Ids based on GUIDs. It is important to note that a service Id must be unique. It will be an error if two external services try to register with the same Id.