What funding source is used to pay for purchases with participating online merchants?
When you make an online purchase from an authorized merchant using your Venmo account and there aren’t enough funds in your balance (or if you don't have access to a Venmo balance), the entire amount of the purchase will be taken from the backup payment method that you’ve set.
Can I use different payment methods when I’m purchasing in merchant apps and websites, and when I’m sending money to friends from the Venmo app or on Venmo.com ?
Yes, you can set different default payment methods for online purchases and payments to friends. You’ll be prompted to set up these payment methods when you make an online purchase for the first time.
How do I change my payment method for online purchases?
To change your payment method for online purchases, navigate to "Settings" in the app. Under the "Buying" heading, tap "Backup Payment." There, you can choose your preferred default or add a new bank account or card.