Refining the site on NetCat

Good afternoon. On the site nrb-shop.ru there was a need for several improvements:
- Add online payment. For example, through the Yu-cash.
- Tie a cumulative discount to your phone number. That is, a person at one of the stages of the ordering enters the phone number, he receives a confirmation code, and the order applies a discount assigned to the customer.
- Integrate the site with retailCRM.
- The management system does not show the details that the customer fills out at the checkout stage.