// Generate and set the key
String subscriptionKey = CartridgeSubscriptionUtils.generateSubscriptionKey();
cartridgeSubscription.setSubscriptionKey(subscriptionKey);
// Create repository
Repository repository = cartridgeSubscription.manageRepository(null, "", "", false);
// Create subscriber
Subscriber subscriber = new Subscriber(subscriptionData.getTenantAdminUsername(), subscriptionData.getTenantId(), subscriptionData.getTenantDomain());
// create subscription