You will need a credit card to make a purchase. The information can only be entered into the payment processor when you make your first purchase, and then it can be saved.
OneShots features trading Cards which can be flipped to view interactive content. Once you purchase a pack, your Cards can be viewed in your Collection.
NOTE: Some banks do not allow crypto purchases, so if you experience issues, please reach out to them. Also, you may have to confirm small purchases as multiples can set off fraud configurations.