Software Architecture with Spring 5.0

Account balance endpoint client

In this case, we will consume an endpoint, available in the URI /api/secure/balance, that uses the GET HTTP verb and requires that the token be used as a header in the request:

public interface BankingApi {  @GET("/api/secure/balance")  Call<BalanceInformation> queryBalance(@Header("x-auth-token")   String token);}

As you have probably noticed, this module uses the BalanceInformation and Credentials classes, so we don't need to write them again; we only need to add the banking-domain module as a dependency.

You're probably wondering where you have to specify the IP address and port for the server, and that is done in the Retrofit object, as follows:

Retrofit retrofit = new Retrofit.Builder()        .baseUrl("http://IP:PORT" ...