Making an extension compatible with opencart 4

I'm currently facing a challenge with my OpenCart Version 4 website while trying to integrate payment with cards through the Bankart payment gateway. Unfortunately, the Bankart extension is only compatible with OpenCart Version 3.

I've reached out to my bank, and it seems like there are two potential solutions: either finding someone willing to make the Bankart plugin compatible with Version 4 or downgrading my website to Version 3.

If you have experience with this or can offer assistance, I'm open to discussing compensation for your time and effort.

Perhaps post it on the Commercial Support section of this forum, to find a suitable developer who can do it for a charge.