[Phase 3] Implement Facebook Shop Integration - OAuth, Webhooks, and Dashboard UI

.env.example

@@ -16,3 +16,9 @@ NEXTAUTH_URL="http://localhost:3000"
 # Email Configuration
 EMAIL_FROM="noreply@example.com"
 RESEND_API_KEY="re_dummy_key_for_build"  # Build fails without this
+
+# Facebook Integration
+FACEBOOK_APP_ID="your_facebook_app_id"
+FACEBOOK_APP_SECRET="your_facebook_app_secret"
+FACEBOOK_WEBHOOK_VERIFY_TOKEN="your_random_webhook_verify_token"
+NEXT_PUBLIC_APP_URL="http://localhost:3000"