IMPORTANT: the credit card fields are ALSO for debit cards that follow the same format as credit cards (16 digit numbers, that online transactions are enabled, and have an expiration date and a 3-digit security code).
ALSO IMPORTANT, FOR THOSE WHOSE CREDIT OR DEBIT CARDS ARE NOT WORKING USING THIS FORM: if you leave the credit card fields blank, then you will be sent a PayPal invoice for payment. This is especially to make entry easier for certain countries whose cards do not always work with Stripe (i.e. India). Please use this option only when necessary.