If You want to find payment, which will be as compatible with the version of the online store, and also pay attention to the quality of the code, then we offer to view: x-fee, this solution was specifically designed for stores, working on the platform OpenCart, with the support of our company from every store that works on CMS Brocart.
When you download a free extension, we do not give 100% guarantee that it will work in your store, please be careful about the installation instructions!
Flat and Percentage both fees are supported
Update 1: I have updated x-fee and it will work with x-shipping pro perfectly. Thanks
Demo: Click here
Need more options? Have a look at X-Fee Pro
For advance shipping module? You can try atAdvance X-shippingpro