> For the complete documentation index, see [llms.txt](https://docs.0xprocessing.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.0xprocessing.com/quick-start/payment-confirmation.md).
# Payment confirmation
A comprehensive guide to verifying and confirming crypto payment transactions securely, ensuring reliability and trust in your operations.
When you integrate a fixed-amount payment method, the client receives a payment form with a fixed amount. A payment of the exact amount specified in the form is considered successful. If the client underpays, the payment receives the Insufficient status and must be confirmed by the merchant.
* The merchant or an authorized manager can confirm payments with the Insufficient status under Confirmations.
* To confirm insufficient payments automatically, enable the corresponding option under Confirmation settings.
When this option is enabled, all underpayments above the minimum deposit amount are processed as successful after the 30–50-minute payment window closes.
The merchant receives the amount paid by the client minus the applicable network and processing fees.
