PayPal gateway has rejected request. Security header is not valid (#10002: Security error Magento

Question

up the pay-pal advance in magento . I have fill all the credentials in magento admin . BUt when i go to frontend and click pay-pal button it gives

Pa

Answer 1

In my case everything seemed fine at Magento level. I asked client questions about PayPal, at which point they tried to login to the paypal.com site and were unable to (authentication failed). Account had been locked. Client was able to resolve with PayPal tech support directly, no Magento issue after all.