A contract defines a boundary between services, making their responsibilities explicit. In a microservices design, standard contracts help identify changes that could break dependent services. section 16.1
Clear boundaries let teams build and test a business-domain service in isolation, supporting faster iteration of its capabilities. section 16.1
Incremental service extraction
When modernizing a legacy application, teams may start by extracting capabilities such as authentication, authorization, or logging into separate services. section 16.1











































