If you haven't sold in over a year, you will find some new quirks in the system.
Your customers' payments will be held for 21 days by Paypal against your good performance. But you will be able to use that money to purchase PP shipping labels immediately.
The Detailed Seller Ratings are more important than feedback.
You get an automatic 5 Star rating for Free Shipping.
Free Shipping means including the cost of domestic shipping in the asking price for the item. If you use Free Shipping, you will not pay FVF on any shipping charges even SuperFastEspressoGoldPlatedInsuredTracked service to Hyderabad.
Make sure the expiration date on your credit card is up to date. That's the most likely problem. Also check that your eBay and Paypal addresses match.