You need a valid credit card if you want to subscribe to Office 365 Plus. We will bill you per month and automatically deduct payment from your credit card.
Accepted credit cards are: Visa, Mastercard and Visa Electron. It is not possible to use other payment methods.
Note: You can try Office 365 for free for 30 days, during this period you don't need to enter your credit card details. This is only required if you decide to continue using Office 365 after the free period has ended.