Accounting connection program with opencart -- 2

Below, you can find our expectations from you for this project: 1. Stock information, prices, prices with discount, product descriptions, photos and other required information must be sent from OrgaMAX accounting software to Opencart. 2. The invoices of paid orders in Opencart must be imported to OrgaMAX. Importing must be unlimited. Invoices must be sorted by their numbers via OrgaMAX. OrgaMAX software sorts invoices by their numbers for Amazon and Ebay. We want same application for Opencart too. As we learned from OrgaMAX team, they do not have any English documents (manuals) unfortunately. They have only German documents. If you examine attached documents, we shared different system integration examples for shop systems such as magento, prestashop, woocommerce with you. (Basically, we want all Woocommerce’s features (adapted by OrgaMAX) for Opencart too). I think that you will not need English documents after examining the attached documents. Could you inform me about the price and the duration of the work? How long does this project take your time? We may have some additional demands (revisions) at the end of the project. Please consider this fact while giving the price. In addition to all, we want to learn more details about your after-sale support system (technical support). How long does your support keep going on? Thanks in advance.