Please note, the below steps are only applicable if you are using iframe to load your donation form on your website
1. Add the allow Attribute to the Iframe Tag
Add allow="payment *" attribute in the <iframe> tag. It is required to load the Google Pay JavaScript API Library.
Example:
<iframe allow="payment *" src="https://your-domain.my.salesforce-sites.com/AAkPay__CheckoutM?payMSetting=a0ZQE000003Nyxp2AC&payMType=a0bQE000001etq3YAA&cachecontrol=1774512639593&camid=" height="2500" width="1080"></iframe>