Signature on PayPal Express
I'm trying to set up payments using PayPal Express. I've got the username and password for the clients' account. I can't seem to see any reference in Paypal to Signature, which PowerStore requires. Where do I find out the signature?
I found a pdf on the Paypal site called "Technical Overview of PayPal as an Additional Payment Option" which I thought might help, but it directs me to PayPal as an Additional Payment Option: Standard Checkout Integration Guide" which I can't find on their site.