Payment gateway integration on abantecart with custom form

[login to view URL] is an ecommerce online shopping website. Website is built in Abantecart shopping cart solutions. We are looking for someone who have working knowledge in abantecart and can integrate Razorpay payment gateway and Paytm payment gateway for online payments and have to make a customized form for the payment method selection directly from the checkout page and send directly to the selected payment method to the razorpay popup form picking the customer mobile and email from the shopping cart database. Also, check the attached screenshot as exmaple to understand better.