Hi, Ive noticed on the latest version of Magento I cant just use the Paypal standard option as I usually do on my older sites. It now automatically also adds express checkout. This isn't a major problem but when I install it and then make a test purchase I get the following error:
PayPal gateway has rejected request. Payment has already been made for this InvoiceID (#10412: Duplicate invoice).
Any ideas?? My site is now live and my product stock arrives on Tuesday from China and at present I can't take payment for it! : - (