Hello @xstoanurag,
Welcome to our Community Forum! I'm sorry to hear you're running into some issues adding that card. You shouldn't have an issue adding an American Express card with a 4 digit security code. If you're running into issues there, I'd recommend making sure you're choosing American Express in the drop-down where it says card type. If you're still seeing issues after that, please reach out to our Customer Support for further assistance.
You can reach Customer Support by clicking Contact at the bottom of the PayPal website.
Good luck!
- Jon K
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