How to pre-fill a default amount for your payment page?
You can pre-fill and display a default amount for the “Customer decides on payment page” option, which customers can modify later.
Eg: If you want the default amount to be $100, you can add ?amount=100
at the end of the URL.
Here’s how that would look in the payment page’s URL:
https://zohosecurepay.com/checkout/td8y7te-qkmuc694qi211/Share-a-Smile?amount=100
Note: You cannot pre-fill an amount that is already defined on the payment page