When I have gettry to make payment via PayPal Gateway then I am getting this error "PayPal gateway has rejected request. Payment has already been made for this InvoiceID (#10412: Duplicate invoice).".
"PayPal gateway has rejected request. Payment has already been made for this InvoiceID (#10412: Duplicate invoice).
I am using paypal express checkoutpaypal express checkout. Some times it works well, but some times it gives error after redirecting to cart page.
Please help.