This is ref. repo for all supporting applications
https://github.com/strongloop/loopback4-example-microservices/tree/master/services/account --> This talks about services in details.
https://github.com/strongloop/loopback4-example-microservices/blob/master/services/account/test/unit/test.ts --> Where caluse details can be found here
https://github.com/strongloop/loopback4-example-shopping/blob/master/packages/shopping/src/repositories/shopping-cart.repository.ts --> Shopping cart example which was refered
https://github.com/strongloop/loopback-next/tree/master/packages
https://auth0.com/blog/run-a-loopback-app-on-google-app-engine/ --> One more example if we are not planning for PassportJS this is AUTHO example
https://zodinet.com/integrate-firebase-authenticate-with-loopback/ -- Firebase example
https://github.com/strongloop/loopback-next/tree/master/packages/authentication#loopbackauthentication -- Auth example
https://medium.com/@vonketelhodtm/getting-started-with-loopback-4-c5d12cd84d0a --> Example Must see
https://developer.ibm.com/tutorials/create-rest-apis-minutes-with-loopback-4/
https://rapidapi.com/dmtech/api/mutual-fund-nav-bse-india1?endpoint=5c218b07e4b067d7d9563a61