Hi,
If you have bought from International Sellers using your credit card or debit card, then your email ID associated (attached)with your eBay account has been automatically considered as your PayPal account.
You may have used a credit card to purchase an item from USA, UK or China but the seller received the payment from a PayPal ID that was automatically created.
Now let us assume that your credit card / debit card falls under any of the below situations --
1) Expired
2) Cancelled
3) You blocked it as it was lost / stolen etc..
4) High Outstanding which you have not paid (in case of CC) (sorry, I don't mean to insult)
In such situation, PayPal will put a block on that email ID which it automatically took as your PayPal ID to complete your buying transactions.
Therefore, even if you update PAN details on your PayPal account, it may not get verified and the problem will persist.
RESOLUTION:
Check which card / bank account was used to make your international payments. If these are not active, then change the credit card or bank account attached to your PayPal account.
Let me know if you still face any issue.
Kind Regards,
MB
PS - Please do not send me any message via eBay messages. Do not try to contact me on phone or email. Please send any message through this forum only.