- Replace map[string]interface{} with map[string]any in GraphQL, metrics, payment gateway, and webhook handlers
- Replace []byte(fmt.Sprintf()) with fmt.Appendf(nil, ...) for cursor encoding in GraphQL resolvers and tests
- Replace strings.HasPrefix/TrimPrefix with strings.CutPrefix for webhook signature parsing
- Replace stripe.Int64/Bool with new() constructor for Stripe payment parameters
- Rename Error
- Add WebhookHandler with Stripe webhook validation and event processing
- Add webhook event handlers: payment succeeded, failed, canceled, and dispute created
- Update transaction status and subscriber balance on successful payments
- Create alerts for failed payments and disputes with appropriate severity levels
- Add sendTopUpNotification to create notifications for successful top-ups
- Add PaymentController
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