FIX PAYMENT ISSUES ON OPENCART WEBSITE

I am looking for an experienced developer to fix a payment gateway issue on my existing OpenCart website. The website is for my existing business and we currently use the Blockonomics payment gateway. We are experiencing an issue where all payment gateways are not showing at checkout.

Ideal Skills and Experience:
-Experience with OpenCart and payment gateway integration
-Knowledge of Blockonomics payment gateway
-Ability to troubleshoot and solve technical issues efficiently and effectively.