The API requires a developer key from Trello which is matched to the redirect URL's used in the OAuth process. It is not used for the CodeStream extension's issues features.
The Trello developer key is associated with a trello account. First, login to Trello and then go to https://trello.com/app-key/. Here you can see the key and the few properties associated with it.
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Add the key to the CodeStream configuration file in the
integrationssection.{ "integrations": { "trello": { "cloud": { "apiKey": "***************************", "disabled": false } } } } -
Make sure your API server's URL is added to the Allowed Origins section. For example,
https://api.codestream.com/.