Module for CMS (delivery service)

Need to do clearance delivery at checkout on the online store website to connect

to connect the online shop to our service delivery (we - courier services)

API is how a PHP class is described, there are ready-made module for WordPress. (will send on request)

specify for which CMS is willing to make, the price and terms

opencart, insales, 1c bitrix, phpshop, pixlpark, retailCRM, ecwid, advantshop, cs.cart, xcart, Magento, NetCat, ModX, Shopify, Abcp, Simpla, Shop-Script, nethouse, Tilda