i need to close my apple cash account

Consider these Steps:

Close your Apple Cash account or turn it off on a device

1. On iPhone or iPad, open the Settings app, tap Wallet & Apple Pay, then turn off Apple Cash.
2. For Apple Watch, open the Apple Watch app on your iPhone, tap Wallet & Apple Pay, then turn off Apple Cash.

Close your Apple Cash account or turn it off on a device - Apple Support

Hello~ Take a look here…

Close your Apple Cash account or turn it off on a device

~Katana-San~