# Payment confirmation
**When you integrate a payment method with a fixed amount**
It is a type of payment where the client receives a payment form with a fixed amount. Payment of the exact amount specified in the form is considered to be successful. In case of underpayment the payment will be displayed as insufficient and must be confirmd by merchant.
* Merchants or [merchant's manager](/quick-start/create-a-manager-role.md) can confirm payments with insufficient status in the menu **Confirmations**
* To automatically confirm insufficient payments, you need to enable the corresponding function in the menu **Merchant\API**
With this feature enabled, all insufficient payments involving more than the minimum amount will be processed as successful after closing the payment window for 30-50 minutes.
The merchant will receive the amount actually paid by the client reduced by a network fee and a processing fee.
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