How to re-install Apple Pay

Hey there Julief114,

There's not a way to reinstall Apple Pay as it's something that can't be deleted from a device. That being said, we'd like to help by learning more about what's happening, along with ruling out some possible causes:

1. What exactly is happening on your device regarding Apple Pay? The more details you provide, the better we'll understand what's happening.
2. Which model are you using?
3. If this is in regards to a an app you deleted, you can download it again from the App Store. This link shows how to redownload apps on your devices: Redownload apps and games from Apple

Cheers!