feat: Verify paddle webhooks

packages/backend/src/helpers/billing/paddle.ee.ts

@@ -0,0 +1,10 @@
+import PaddleSDK from 'paddle-sdk';
+import appConfig from '../../config/app';
+
+const paddleClient = new PaddleSDK(
+  appConfig.paddleVendorId.toString(),
+  appConfig.paddleVendorAuthCode,
+  appConfig.paddlePublicKey
+);
+
+export default paddleClient;