disable polling for offline checkout methods

Author: ajungg

build.gradle

@@ -24,7 +24,7 @@ allprojects {
     }
 
     project.ext {
-        sdkVersion='0.9.0-beta8'
+        sdkVersion='0.9.0-beta9'
         versionCode=1
 
         compileSdkVersion=28

core/src/main/java/io/snabble/sdk/Checkout.java

@@ -409,8 +409,11 @@ public void onResponse(Call call, Response response) throws IOException {
                             checkoutProcess = gson.fromJson(json, CheckoutProcessResponse.class);
                             if (!handleProcessResponse(checkoutProcess)) {
                                 notifyStateChanged(State.WAIT_FOR_APPROVAL);
-                                scheduleNextPoll();
-                                Logger.d("Waiting for approval...");
+
+                                if (!checkoutProcess.paymentMethod.isOfflineMethod()) {
+                                    scheduleNextPoll();
+                                    Logger.d("Waiting for approval...");
+                                }
                             }
 
                             inputStream.close();