implemented balance headers

src/services/WalletService.ts

@@ -4,6 +4,14 @@ class WalletService extends BaseService {
     constructor(appService: AppService) {
         super("/wallet", appService);
     }
+
+    getBalance = (params?: Object, headers?: HeadersInit) => {
+        return this.appService.get(
+            this.endpoint + "/wallet-header",
+            params,
+            headers
+        );
+    };
 }
 
 export default WalletService;