INFO
Current format Swagger: 2.0. Notice that some files are still flagged with warnings on the official OpenAPI validator.
Download the swagger files to generate your own client, you can find them below:
You can rely on a tool like swagger-codegen to generate a client using the language you need. You can run it locally using docker, it should be as easy as:
docker run --rm -v ${PWD}:/dist swaggerapi/swagger-codegen-cli generate \ -i /dist/swagger.json \ -l php \ -o /dist/out/php