Update

app/src/main/java/com/yono/messeripos/MainActivity.java

@@ -56,6 +56,7 @@ import com.yono.messeripos.utils.Utils;
 import java.util.ArrayList;
 import java.util.List;
 
+import okhttp3.ResponseBody;
 import retrofit2.Call;
 import retrofit2.Callback;
 import retrofit2.Response;
@@ -140,6 +141,11 @@ public class MainActivity extends AppCompatActivity {
         productAdapterListener();
         categoryAdapterListener();
         formCategoryListener();
+        punyaAbiCoba();
+    }
+
+    private void punyaAbiCoba() {
+        
     }
 
     private void toolbarSetOnItemClicked() {

app/src/main/java/com/yono/messeripos/api/service/ProductService.java

@@ -7,18 +7,22 @@ import com.yono.messeripos.response.DataResponse;
 
 import java.util.HashMap;
 import java.util.List;
+import java.util.Map;
 
 import okhttp3.MultipartBody;
 import okhttp3.RequestBody;
+import okhttp3.ResponseBody;
 import retrofit2.Call;
 import retrofit2.http.Body;
 import retrofit2.http.DELETE;
+import retrofit2.http.Field;
 import retrofit2.http.GET;
 import retrofit2.http.Multipart;
 import retrofit2.http.POST;
 import retrofit2.http.PUT;
 import retrofit2.http.Part;
 import retrofit2.http.Path;
+import retrofit2.http.QueryMap;
 
 public interface ProductService {
     @GET(ApiHelper.VERSI_API_1+"products")
@@ -43,4 +47,7 @@ public interface ProductService {
             @Part("stock") Integer stock,
             @Part("category_id") int category_id
     );
+
+    @POST("https://ws-dev.oktapos.com/ws/synitem")
+    Call<ResponseBody> syncData();
 }