Fetch Ebay Token using Session ID

I'm trying to get the ebay GetSessionID and FetchToken functions to work - I've set up the credentials for my application ok, so I have DeveloperID, ApplicationID, CertificateID and RuName - when I call GetSessionID, ebay generates a sessionid for me, I then call eBay's consent form, where I log in to a sandbox user account, and ebay redirects me back to my web application.

The problem is that when I call the FetchToken function, passing the SessionID returned to me previously, I get the an error message:

2016-12-17T08:37:[url removed, login to view] session [url removed, login to view] SessionID in your request is invalid21916015ErrorRequestError983E983_CORE_APISIGNIN_18076437_R1

I'm hiring a person to Fix this Error to get to FetchToken.

The script is ran on PHP and runs on a wordpress CMS.

Also it's not from Ebay Developer sandbox but on Ebay Developer Production

Evner: eBay, PHP, Software Arkitektur

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