Hi there BDep,
Thanks for joining us in Apple Support Communities! We understand you're asking if there is a different way to add money to Apple Cash besides using a debit card from your Wallet. We're glad you're here and we can provide some guidance.
"After you set up Apple Cash, you can add money to your balance using the debit or prepaid cards that you already use with Apple Pay in Wallet. If you don’t already have one of these cards in Wallet, you need to add one before you can add money." Have a look at this link to learn more about how to add money to Apple Cash:
Add money to Apple Cash
With that said, you'll need to add a debit or prepaid card from a participating bank to use with Apple Pay in the Wallet app before you can add money to Apple Cash. This link provides details about which payment methods can be used based on where you're located:
Apple Pay participating banks in Canada, Latin America, and the United States
Also, you can visit this link to learn how to add a card to your Wallet and set up Apple Pay:
Set up Apple Pay
We hope this information is helpful. Don’t hesitate to let us know if you have any more questions.
Take care.