When using Apple Pay, Apple will send a Wallet notification for every transaction you make if you've got this switched on. This is separate from any notifications sent by the Yonder app.
Want to turn off Wallet notifications?
You can disable them by following these steps:
Open your iPhone Settings
Tap Notifications
Scroll down and tap Wallet
Toggle off Allow Notifications
This will stop the additional notification from Apple but you’ll still receive updates from Yonder.