For Fiat, only wire transfer is allowed. Credit cards aren't allowed for ICO.
What is wire transfer,can you explain please?
Wire transfer, bank transfer or credit transfer is a method of electronic funds transfer from one person or entity to another. A wire transfer can be made from one bank account to another bank account or through a transfer of cash at a cash office.
Source: https://en.wikipedia.org/wiki/Wire_transfer
Cheers!