How do I change my payment source in PayPal?

Follow these steps to change credit or debit card details:

1. Log in to your PayPal account.
2. Go to Profile. 
3. Click Profile & Settings.
4. Select Selling tools.
5. Select Update under my automatic payments.
6. Click the pre-approved payment plans link.
7. Select the correct Vtiger preapproved payment charge. When the order is placed, buyers will have received a confirmation email from PayPal with the preapproval key.
8. Click the Change link at the bottom of the screen.
9. Select or add a new payment source.
10. Click Save.

Once you are done changing the card details, notify the seller so that they charge the order.
To know more about PayPal, click here.