Hi there, I am an expert WordPress E-commerce developer and customize/create several plugins. I would love to work with you to fix the payment gateway issue as per your need it. I understood your problem and details. I assure you my work will amaze you.
Can I see your WordPress site?
I'd like to discuss the project to get the complete scope of the work so, we can decide the budget and timeline with mutual understanding, for me satisfaction is an important thing, I have several clients who are satisfied with my work and love to work with me again and again, I assure you that you will love to work with me after the discussions.
Regards,
US