By checking your main funding source and backup in the Review your payment page during checkout. Info about backup payments: https://www.paypal.com/us/selfhelp/article/what-is-my-backup-payment-method-faq1054 https://www.paypal.com/us/selfhelp/article/how-do-i-change-my-backup-payment-method-faq661 https://www.paypal.com/us/selfhelp/article/backup-payment-method-information-faq445
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