You have to create an API key on your GitHub account in addition to the spark API key. It is a bit confusing but once setup it does work.
Jun 12, 2016
2
Level 5
Install Spark (windows) - Invalid credentials for gitHub
I followed the steps in the spark documentation, I purchased spark license and joined the Spark GitHub repository, but when i used the command 'composer update' i am prompted with a GitHub authentication. I keyed in the correct github authentication. but i always get '[Composer\Downloader\TransportException] Invalid credentials for 'https://spark-satis.laravel.com/packages.json', aborting. '
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