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  • Derek Harmon thinks this is interesting:

a link to the customer portal, along with the profile data to retrieve order history

From

Cover of Microservices for the Enterprise: Designing, Developing, and Deploying

Note

A key uniquely-identifying the customer must be in this profile data someplace. The authors still have not discussed explicitly how the Customer microservice, who is the upstream bounded context for the profile data, and other microservices agree to it. Not unless the reader is supposed to infer this agreement came about as part of team collaborations in the "Partnership pattern" or "Customer/Supplier pattern."