chore: bump package version to 0.1.9 and simplify test provider initialization logic

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@xtr-dev/payload-billing",
-  "version": "0.1.8",
+  "version": "0.1.9",
   "description": "PayloadCMS plugin for billing and payment provider integrations with tracking and local testing",
   "license": "MIT",
   "type": "module",

src/providers/test.ts

@@ -432,7 +432,7 @@ export const testProvider = (testConfig: TestProviderConfig) => {
         }
       ]
     },
-    onInit: async (payload: Payload) => {
+    onInit: (payload: Payload) => {
       logWebhookEvent('Test Provider', 'Test payment provider initialized')
 
       // Clean up old sessions periodically (older than 1 hour)