Hey, Jiang!
Aria here, I’m on the Social Care team at Shopify.
In most cases, you’ll find out Apple Pay is already set up. To check, go to Settings > Payment Providers in your admin. Click Edit next to Stripe. You should then see information that looks like this:
If you can see the tick in the box next to the Apple Pay logo, you will know it is activated.
Keep in mind, Apple Pay will only show up on Safari and Apple devices. If your customer is using an Android device or Chrome (for example), they won’t see the option to pay that way. You can find more information in this guide.
Please let me know if you are still having problems and I will reach out to you by email.
Aria
Social Care Guru
Shopify