I, like others, am getting the:
We are sorry for the inconvenience. The PayPal account in this store is presently misconfigured to use mixed sandbox and live settings. We are unable to complete your transaction. Please notify the store owner so they can correct this problem. (10002) 10002 Security error - Security header is not valid
I had initially built my store using the full-fileset 12302006 version, then patched it with the latest ec patches. When I got this error, I thought it might be because I'd left out or misplaced a file in the patching process, so I downloaded the 1.3.7.1-full-patched-07052007 set and rebuilt my store from scratch. To no avail.
I am still getting the error. I logged in to developer.paypal.com, got my api credentials from the sandbox, copied and pasted, and ensured that there were no leading or trailing spaces in my id, password, or signature.
Anything else? I appreciate any help you can offer.
Thanks,
Patrick
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