Will a payment option other than paypal be available in the future?
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You can also pay with your bank card. After you see the "Pay with PayPal" button, it will take you to a screen in which you will have the option to select "Pay with debit or debit." This way, you don't need a PayPal account. As far as a third option, I'm not aware if Itchio has a different payment option other than those two.