> For the complete documentation index, see [llms.txt](https://simpaypl.gitbook.io/simpay-laravel/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://simpaypl.gitbook.io/simpay-laravel/direct-billing.md).

# Direct Billing

- [Validate IPN signature](https://simpaypl.gitbook.io/simpay-laravel/direct-billing/validate-ipn-signature.md)
- [Generate transaction](https://simpaypl.gitbook.io/simpay-laravel/direct-billing/generate-transaction.md)
- [Get transaction info](https://simpaypl.gitbook.io/simpay-laravel/direct-billing/get-transaction-info.md)
- [Calculate amount](https://simpaypl.gitbook.io/simpay-laravel/direct-billing/calculate-amount.md)
- [Responses](https://simpaypl.gitbook.io/simpay-laravel/direct-billing/responses.md)
- [TransactionInfoResponse](https://simpaypl.gitbook.io/simpay-laravel/direct-billing/responses/transactioninforesponse.md)
- [NotifyResponse](https://simpaypl.gitbook.io/simpay-laravel/direct-billing/responses/notifyresponse.md)
- [AmountCalculatorResponse](https://simpaypl.gitbook.io/simpay-laravel/direct-billing/responses/amountcalculatorresponse.md)
- [AmountResponse](https://simpaypl.gitbook.io/simpay-laravel/direct-billing/responses/amountresponse.md)
- [Enums](https://simpaypl.gitbook.io/simpay-laravel/direct-billing/enums.md)
- [AmountType](https://simpaypl.gitbook.io/simpay-laravel/direct-billing/enums/amounttype.md)
- [TransactionStatus](https://simpaypl.gitbook.io/simpay-laravel/direct-billing/enums/transactionstatus.md)
- [MobileCarrier](https://simpaypl.gitbook.io/simpay-laravel/direct-billing/enums/mobilecarrier.md)