Hello Tenna289,
Have you already set-up Apple Pay and/or Apple Cash on your iPhone?
If not this Apple Support article will walk you through the requirements to be able to set up the features and explains the possible verification steps to complete the set up.
https://support.apple.com/en-us/HT207875#whatyouneed
Also note the age and location restrictions in case either is relevant.
“To send and receive money with Apple Pay, you must be at least 18 years old and a resident of the United States. If you're under 18 years old in the United States, your family organizer can set up Apple Cash for you as part of Apple Cash Family. Then, you can send and receive money with Apple Pay. Sending and receiving money with Apple Pay and the Apple Cash card are services provided by Green Dot Bank, Member FDIC. Learn more about the Terms and Conditions.“
I hope this helps.