A company is using both Service Cloud and B2C Commerce but they are not using Mulesoft or any other integration middleware and do not plan on adding that in the near future. However, there is a need to keep customer records in sync across both Service Cloud and B2C Commerce. When a change to the customer record in Service Cloud takes place, such as an updated customer name, the same customer record should be updated in B2C Commerce. Assume that there is a common ID that uniquely identifies the customer across the two systems.
How should a Solution Architect deliver the desired functionality?

Northern Trail Outfitters (NTO) wants to unify customer data with a single identity for each customer across their ecommerce sites and their communities. Communities are treated as an identity provider (IDP) for commerce. The communities also allow self-service support for products via knowledge articles and crowd-sourced Knowledge and Chatter.
For which customer data should Experience Cloud be the system of record?

A developer uses the call() instance method of dw.svc.Service to invoke a web service and implemented the callback methods defined by the dw.avc.ServiceCaliback class.
Which callback method is required only when invoking a SOAP service?