gRPC could be used in an e-commerce application to enable efficient and reliable communication between the internal microservices in the system. B

st practice to use gRPC in sync communications between internal microservices. 

Because of the performance requirement and not need to see payload like client application communications. 

For that reason, When add item into ShoppingCart, we can use gRPC for request to product detail information and also get latest discount information.

https://www.altexsoft.com/blog/what-is-grpc/