The extension provides social login authentication with firebase api, besides default opencart login.
It has extensive rules for delivery date and time/slot validation and delivery charges.
The more fields you have , the more chances of abandoned orders , so it provides drag and drop sorting of fields. It is an Easy and fast checkout.
The extension is ocmod based and works fine with the default opencart structure, developer would not be responsible for 3rd party conflicts.

demoapp.opencartext.com/index.php?route=checkout/checkout for demo login


Please check the extension before purchase to avoid hassles before.
If you have any queries do ask at shambhalnetworks@gmail.com