How can I integrate QuickBooks with OpenCart?

Integrating QuickBooks with OpenCart can streamline your accounting process. You can use a specialized module like the OpenCart QuickBooks Integration to automatically sync your sales, inventory, and customer data between both platforms, saving time and reducing errors.

Your website is quite vague. If you really want customer to buy your OpenCart extensions, you have to provide some more details (e.g supported OC versions, does it use OCmod or event handlers, pricing, etc).