I am trying to create custom policies for some of requirements. I am not able to find good documentation on Identity Experience Framework. Is there a reference guide that explains about technical profiles, user journeys, claim providers, relationship between them etc?
I looked at online documentation here: https://docs.microsoft.com/en-us/azure/active-directory-b2c/active-directory-b2c-overview-custom, but it is not helpful much.
You can also refer to documentation that can be found in this GitHub repository. This was drafted for the custom policies preview (known as the "Azure AD B2C Premium" service when this was written). Some of it is out-of-date but it does describe the high-level concepts and details the custom policy schema.
15 Sep 18: UPDATE
The official documentation for the Identity Experience Framework schema can now be found at https://docs.microsoft.com/en-us/azure/active-directory-b2c/trustframeworkpolicy.
There are several. For learning to develop custom policies, we recommend Gaining Expertise with Azure AD B2C, a course for developers. The later modules go into custom policies pretty extensively.
