Error 100 message from the App Store

Trying to download Logic Pro X on my MacBook Pro I'm getting this message:
"We could not complete your request. There was an error in the App Store. Please try again later. (100)"
I've double checked my card details, restarted my machine etc.
Please help!

Hello, Nick.
I see you have already processed some troubleshooting steps. There are just a couple more steps I could recommend for this issue. Here are a couple articles that will walk you through the remainder of the troubleshooting steps.
Mac App Store: "An unknown error occurred (100)" when purchasing
http://support.apple.com/kb/TS3637
Troubleshooting the Mac App Store
http://support.apple.com/kb/ts3624
Cheers,
Jason H.

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Error 100 message from the App Store

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