Change payment amount
<ChangePaymentAmount>false</ChangePaymentAmount>
The <ChangePaymentAmount> tag is used to define whether the payment amount can be changed as compared to the actual bill amount on the Checkout screen.
If defined as true, the user will be able to change the payment amount at checkout.
If defined as false, the user will not be able to change the payment amount at checkout.
The default value is false.