I don't know the specific ZKP variant if that's what you mean, but the general architecture of the system is best described in the 38C3 talk from earlier this year: https://www.youtube.com/watch?v=PKtklN8mOo0

There are some choices that are debatable (more on the issuer side iirc), but imho for the goals it has it's a competently made architecture.

See https://github.com/google/longfellow-zk