Hello,
To set a fixed amount you can add an amount value in the shortcode. For example, on the page where the form lives you should see something similar to:
[affinipay-payment account=Bhb-067HV8mvV4hjQCD]
Simply add “amount=” after the ID so it appears like so:
[affinipay-payment account=Bhb-067HV8mvV4hjQCD amount=50.00]
In the above example, the page would always charge $50.00.
You can also always email our support team at support@affinipay.com
Thanks!
-Paige