Quick Checkout helps you to change from multiple steps checkout into a single checkout page.
AbanteCart v1.2.16 use Quick Checkout v1.2.16. Tested up to PHP 7.4.
AbanteCart V1.2.15 use Quick Checkout v1.2.15.
AbanteCart V1.2.6 – v1..2.13 use Quick Checkout v220.127.116.11.
1. Starting with extension v1.2.15 we have adopted a license key for all our extensions. Your extension will only work if you have a validated license key entered for the location where your extension is installed. Refer to here for more details on how license keys work.
2. AbanteCart v1.2.14 is extremely problematic. Install Patch files or better to update to 1.2.15.
Not all third-party payment extensions in the MarketPlace have the necessary hook elements to work with this extension. Altering those payment extensions is beyond the scope of our support and the request needs to be made to the payment extension developer.