The documentaion here is continually being updated, so some portion may reflect current status while others may not. The code, however, has been updated well.
The documentation of Application Programming Interface of Order Manager is accessible at:
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Product API Doc (HTML format): http://localhost:8080/doc/webui

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Product API Doc (JSON format): http://localhost:8080/doc/json

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Order API Doc (HTML format): http://localhost:8081/doc/webui

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Order API Doc (JSON format): http://localhost:8081/doc/json

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Inventory API Doc (HTML format): http://localhost:8082/doc/webui

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Inventory API Doc (JSON format): http://localhost:8082/doc/json

Setup for generating API documentation for Product module is illustrated below. Similar steps for Order and Inventory modules offer consistent results.
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Add the following dependencies in
pom-xml(or in respective format inbuild.gradle.kts/build.gradle):
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In
application.propertiesundersrc/main/resources, add the following two resources (kea-value pairs):
springdoc.swagger-ui.path=/doc/webui springdoc.api-docs.path=/doc/json
The first pair above is to view the API documentation in HTML format (web-based GUI). And, the second one is to access the API doc in JSON format; this response of this service endpoint is so versatile that it can be fed for consumption into any REST client as well as read easily by humans.
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Lastly, create this configuration file (Java class or equivalent in another JVM language) in classpath-
OpenApiSpecsConfig:
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Then add the code (Java code has been added, feel free to switch to Kotlin if you prefer!).
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Now sit back tight and do the dirty engineering on service endpoints, integration and parameter matching.
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Run
docker-compose up -dout of Product, Order and Inventory services. -
Start (Run.../Debug...) Product, Order, Inventory and Gateway services with IDE or CLI.
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Hit Product service over the port of Gateway. You succeed to access the service endpoint:

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I thank all who have mentored, taught and guided me. Also, I appreciate who have supported my work with pair programming and more.