> For the complete documentation index, see [llms.txt](https://docs.optty.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.optty.com/universal-integration-features.md).

# Universal Integration Features

- [Notification Handling](https://docs.optty.com/universal-integration-features/notification-handling.md)
- [Exception Handling](https://docs.optty.com/universal-integration-features/exception-handling.md): This page explains some exceptions that could occur when handling the payment response.
- [Order Reconciliation Service](https://docs.optty.com/universal-integration-features/order-reconciliation-service.md)
- [Channels](https://docs.optty.com/universal-integration-features/channels.md)
- [Enabling a Payment Method](https://docs.optty.com/universal-integration-features/enabling-a-payment-method.md): This guide explains how to add and configure a payment method for your merchant account using the UPP (Universal Payment Platform).