That is a big subject.
I suggest you start with the “Product Support Information”. In MIP Documentation pick Protocol integration, in the left hand side you the see “Product Support Information”.
Underneat this there is documentation for the protocols..
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One notable change is that basic users are not the same - https://force.milestonesys.com/support/articles/en_US/FAQ/MIP-SDK-applications-and-basic-users-in-XProtect-Corporate-or-XProtect-Expert