My Apple Cash card was ristricted why
How do I unrestrict my Apple Cash card
iPhone 6s Plus, iOS 13
The most common reason an Apple Cash account is restricted is because you have not verified your identity with Green Dot Bank, servicer of Apple Cash. Here are to support articles that covers several ways you may be able to solve your issue.
If your Apple Cash account is restricted or locked - Apple Support
Identity verification for Apple Card or Apple Cash - Apple Support
Apple Cash is a service that’s run by Green Dot Bank
https://applecash.greendot.com/termsconditions/
Contact Green Dot Bank by calling (877) 233-8552