It will show all payment methods icons if you want to add UPI icon then just upload UPI icon in your Shopify store copy URL of the icon and just put like this-
<img src="url" height="50" alt="UPI">
Just paste the icon url in src="paste here"
Please let me know if works and mark as solve!
Sandeep Parihar | Shopify Partner - Was my reply helpful? Click Like to let me know! - I reply you to solve the problem? If solved the tag to solve please - Hire me, if you want to design, re-design, develop a store, or made any changes to the pre-built store.