Initialize

####Create a service interface

public interface GitHubService {

    @GET("/repos/{user}/{repo}")
    void getRepo(
           @Path("user") String user,
           @Path("repo") String repo,
           Callback<Repo> callback
    );

    @Mock
    @Headers 
    @POST("/repos/{user}")
    void addName(
          @Path("user") String user,
          @Header("auth") String authToken,
          @Body Repo repo,
          Callback<Repo> callback
    );
}

####Initialize the wasp

GitHubService service = new Wasp.Builder(this)
    .setEndpoint("https://api.github.com")
    .setRequestInterceptor                     // Optional
    .trustCertificates                         // Optional
    .setHttpStack                              // Optional
    .enableCookies                             // Optional
    .setNetworkMode(NetworkMode.MOCK)          // Optional(Used for Mock)
    .build()
    .create(MyService.class);

####And use it everywhere!

service.fetchRepo("github","wasp", new Callback<List<Repo>>{
    
    @Override
    public void onSuccess(WaspResponse response, List<Repo> repos) {
        // do something
    }
    
    @Override
    public void onError(WaspError error) {
        // handle error
    }
});