Building a Team-Optimized API Server with Ktor

The KakaoPay Postpaid Payment TF shares the process of attempting to adopt Ktor to fit the team's development conventions and environment.

To clearly identify dependencies when creating the project, instead of using the Ktor Generator, they directly created a Kotlin project and set up the dependencies. For server configuration, they adopted the EngineMain approach, which separates the configuration file to improve visibility, and utilized application.yaml.

They leveraged Ktor's core feature, plugins, to meet the team's requirements.

• ContentNegotiation: Integrated the Jackson library to support JSON format.
• Data serialization: Implemented custom serialization/deserialization logic for handling LocalDateTime, and applied SnakeCaseStrategy to match the API spec.