- Updated the `PaymentRequest` model to include a new `Kind` property, distinguishing between `Subscription` and `RoleChangeTopUp` requests. - Modified the `TelegramNotifier` to accommodate the new request type, ensuring accurate notifications for role change top-ups. - Enhanced the `ConfirmPaymentRequestCommandHandler` to handle role change top-ups without extending the billing period, reflecting the new payment logic. - Updated various application components and tests to support the new payment request structure and ensure proper functionality. - Revised API documentation to clarify the behavior of role change top-ups and their impact on billing.