I have experience with payment plugins for nopCommerce 4.6 and can assist you with integrating the following gateways: Amazon Pay, 2Checkout, PayTabs, BayanPay, Tab, and HyperPay.
Please feel free to reach out to me via email at: Email: jack(at)technogiq(dot)com Skype: live:.cid.a0f06a69cf1c6478