Improve the site on modx. Integrate with 1C

There is a layout site, an online store, developed on the modx engine. It is necessary to refine the functionality of the site. And also it is necessary to connect the work of the site with 1C: Trade Management for Kazakhstan (Uploading the catalog from 1C to the site, Return uploading the catalog from the site to 1C, transferring the invoice for payment)
Link to TK: https://docs.google.com/document/d/1RQ8HW85nQPnfl7IednqLbtwLCWF6fIwaki3lRrlkFes/edit