Using the tooling provided here, we can generate the client SDK's for any language
https://github.com/openapitools/openapi-generator
Since I'm working on AntennaPod, I'm generating Java SDK to access the subscription API
I'm capturing progress here https://github.com/tonytamsf/openpodcastapi-java-client-sdk
and the steps I'm using here https://github.com/tonytamsf/openpodcastapi-java-client-sdk/blob/main/START.md
cc @keunes