Here are some similar threads that may help you @Reema bhatia
You could also try clearing the apps cache in settings, apps, Samsung Pay, Storage, clear cache and or soft reboot by turning the phone off and on.
You may want to consider using Google Pay in the interim.
Daily Driver > Samsung Galaxy s²³ Ultra 512Gb in Phantom Black.
The advice I offer is my own and does not represent Samsung’s position.
I'm here to help. " This is the way. "