Hi
I have expertise in custom wordpress development and woocommerce.
You can see on [login to view URL] - we have solved out various issue related to payment gateway of paysense payment gateway, and also done various custom modification in look and css for client requirement.
So I can sure help with your website too. I will first create a staging website based on your same website under a subfolder using the plugin sitepush - [login to view URL]
When we are all done with the changes needed, I will transfer that site to the live one. So you don't have to pay anything in advance , I will first do all these updates to satisfaction level beforehand and when you are fully satisfied, only then you will have to pay the amount and I will transfer the site to live.
Thanks
Hozefa