General – Optimizing your WooCommerce cart/checkout when using an Iframe-based checkout
Optimizing can be very powerful when it’s properly configured but when using a Iframe-base checkout such as Klarna Checkout, Klarna Payments, Dibs Easy, Collector, Afterpay, Ecster Pay etc. there can be compatibility issues.
- The JS, CSS files is moved around.
This can result in that the checkout doesn’t appear at all.
- You are minifying/concatenate/caching HTML, CSS and JS-files.
This can result in double orders, wrong Information in the orders etc.
Common plugins in use when these errors appears:
- WP Fastest Cache
- WP Rocket
- W3 Total Cache
The summary of this is that if you use a Iframe-based checkout you should NOT do anything with the HTML, JS or CSS on the cart/checkout page.