Connect Yukassa to the site on Modx

There is a website on Modx: https://pronirvana.ru/
Payment system: https://yookassa.ru/

Tasks:
1. Create a shopping cart on the site. I will send the visual, the functionality was taken from
https://shop-polaris.ru/basket/order/ https://www.oldi.ru/personal/order/make/
https://www.premier-techno.ru/personal/order/make/
2. Connect a payment system

We expect the cost and timing