Fetch shema in json format and save to shema.json file (use full_schema_query.graphql)
If not already done, install: https://github.com/potatosalad/graphql-introspection-json-to-sdl
Run: graphql-introspection-json-to-sdl schema.json > schema.graphql
Copy queries and mutatons to relavant files pointed by graphql.config.yaml
Generage Ballerina client: bal graphql -i graphql.config.yaml -o graphql_client_cg_src
copy bal files within graphql_client_cg_src to Ballerian REST api project folder