- implemented functionality of adding to preferred calls;

src/service/preferred-bando-service.js

@@ -0,0 +1,10 @@
+import { NetworkService } from './network-service';
+
+const API_BASE_URL = process.env.REACT_APP_API_EXECUTION_ADDRESS;
+
+export default class PreferredBandoService {
+
+    static addToPreferred = (body, callback, errCallback) => {
+        NetworkService.post(`${API_BASE_URL}/beneficiaryPreferredCall`, body, callback, errCallback);
+    };
+}