contact replication from sap c4c to hybris.

Hello Experts,

I am working on Hybris Commerce and SAP C4C integration where we have a requirement as below.

Once the contact is created in C4C and associated with the customer, its needs to be replicated to Hybris ecommerce. I am new to Hybris ecommerce and do not if contact data flows back to Hybris commerce from C4C. If yes then how the user id gets created for that contact to login to storefront

Thanks Vijay