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 s²² Ultra 256Gb. Samsung Gear s³ Frontier Watch. Samsung Galaxy Watch⁴ Classic.The advice I offer is my own and does not represent Samsung’s position. I have no affiliation with Samsung.