I have had a PayPal account for more than ten years and have used the linked credit card 10 times this year including 4 times this week. It is for this reason I ask why when trying to purchase something with this one vendor I was being asked to enter a card number. I could have just followed the prompt by entering my card number regardless of the fact that I already have a card linked to my PayPal account. I didn't to that, obviously, because I'm concerned that there might be a glitch allowing my credit card number to be revealed to someone I don't know.
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