The site is built on CMS Bitrix. Certainly at first glance nothing special, but the customer has a specific 1C with a special filling and attachment to the related goods, so all exchanges are made from zero. Loaded goods have first a default set (if this product means as a set), then its setup can be changed to another setup (which said by the site administrator) and purchased, immediately paid, at a different price. Well, and a lot of other opportunities that online stores have. And + to all this is full connection with CRM (B24). When ordering the application goes to the CRM, and from it already in 1C, and if the manager has changed the order to the CRM, then it is also downloaded to the site and 1C. Everything is connected by exchanges.