How can I display express checkout buttons like Apple Pay and Google Pay on my product page and cart in my Shopify Store?

Dynamic checkout buttons serve as an alternative to the Add to cart button for individual products. With dynamic checkout buttons, your customers have the option to skip the cart and proceed straight to the checkout process. They can choose to check out with Apple Pay or Google Pay, depending on what is eligible based on the browser and platform they are using.

To enable this on your store please refer to this guide - Display dynamic checkout buttons on product pages