[Question]: exponsing gRPC services to remote clients

[mgenov]

What structure is proffered in case when some service needs to expose it's API calls to remote one (gRPC or HTTP) ?

Case 1)

client/grpc/client.go (returns listing.X and accepts adding.X)

Case 2)

client/grpc/client.go 
                   types.go (defines it's own types such as: GetX and AddX)

Maybe there is better option which is not mention?

Will be grateful if I get feedback on this topic.