Add new purchase API

src/api/purchase.ts

@@ -1,6 +1,6 @@
 /*
  * server component for the TimeLimit App
- * Copyright (C) 2019 - 2020 Jonas Lochmann
+ * Copyright (C) 2019 - 2022 Jonas Lochmann
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU Affero General Public License as
@@ -122,6 +122,7 @@ export const createPurchaseRouter = ({ database, websocket }: {
           database,
           familyId: deviceEntry.familyId,
           type,
+          service: 'googleplay',
           transactionId: orderId,
           websocket,
           transaction