Hello!
I am Kishore G., an expert OpenCart developer working with Global Technosys. I have examined your requirement to upgrade the extension of payment from 2.0 to 2.3. I have already developed many OpenCart based eCommerce websites.
Key Skills:
OpenCart, PHP, HTML, CSS, Jquery, JavaScript, Ajax, Bootstrap and eCommerce websites.
Regards
Kishore G.
Global Technosys