My Apple Pay icon does not appear under text messaging

Hello and welcome to Apple Support Communities, Payhelp!

I understand you're not able to see the Apple Pay app in the app drawer. I'd be happy to show you how to manage this.

Have a look at this article: Use iMessage apps on your iPhone, iPad, and iPod touch

"Manage iMessage apps

You can add apps to your Favorites so you have quick access to them in the app drawer. You can also reorder apps in the app drawer, remove the ones you don’t want, and more. Here’s how:

1. From the app drawer, swipe left and tap .

• • Tap Edit in the upper-right corner to do the following:To add an app to your Favorites, tap .
  • To remove an app from Favorites, tap , then tap Remove from Favorites.
  • To reorder apps in the app drawer, touch and hold , then move the apps in the order that you want.
  • To hide an app, turn it off.

2.Tap Done."

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Enjoy your day!