Order in 1 click - functional improvement

The task was to write the order function of the product in 1 click for the internet shop on cms Opencart.
The functional must work according to SL. When you click on the "buy" button, the product is automatically added to the basket and the user will be displayed a floating window in which the user can enter his name and phone number and make an order in 1 click, or simply continue the purchase.

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