Service API version 3.0 contains a breaking change compared to the previous version 2.x. This breaking change requires code changes in website implementations depending on Service API.
Service API 2.x included an OWIN startup class, which configured Service API to work with ASP.NET Membership authentication. To add the possibility of using ASP.NET Identity authentication, this built-in startup class has been removed. The OWIN startup configuration is now the responsibility of the website implementation.
In addition, the IntegrationTokenTimeout configuration parameter has been deprecated and replaced by a configuration option in the OWIN startup.
See Installation and configuration for examples of OWIN startup configurations, including how to use Membership authentication like Service API 2.x.
Updated 10 months ago