The cards your business accepts on Shop Pay will depend on your payment processor. Shop Pay itself does not restrict card types, as it is only an extension of using the Shopify platform. However, your processor may have its own restrictions on card brands. So, it's easy to accept payments from all major credit cards on Shop Pay such as Visa, Mastercard, and American Express as long as it's permitted.For example, if you use Shopify Payments as your payment processor on Shop Pay, US-based businesses can accept major cards brands like Visa, Mastercard, American Express, Discover because Shopify allows these brands.