How can I make a shopping cart and checkout in a pop-up form so as not to leave the page?

Question

1C-Bitrix

I have a start edition, but there is only one page and there are goods on it, I would like the user to be able to do all the actions to purchase goods on this page,
like on this site demo.innova-lab.ru/gifts,

or maybe there is some kind of free solution where everything is done in the form without leaving the page?

Answer 1

The Start edition does not have an online store, there are third-party paid solutions for the marketplace that turn it into a store. ( Example )
Well, or all by yourself from scratch, armed with Bitrix documentation, and using php and javascript.