ICloud upgrade
How to pay for iCloud upgrade by MasterCard or Debit card if the person is not having credit card??
You can use an iTunes Store credit, if you have it, see the last footnote on this page: iCloud storage plans and pricing - Apple Support
Accepted payment methods for iCloud storage upgrades include credit cards, debit cards, and iTunes Store credit. If you don't have enough iTunes store credit to complete your upgrade, you'll be charged the remaining amount. Apple Store gift cards aren't accepted as payment for upgrading iCloud storage. Learn how to manage the amount of storage you're using.