When logged into account.housecanary.com, you're able to view and create API keys by clicking settings, and selecting the API Settings tab towards the top of the window. You're able to create 3 API Keys, and 3 Test API Keys which can be used for verifying functionality in a development or staging environment.
To create a new API Key, click the plus symbol, and a new API and Secret Key will be generated and saved automatically. Make sure to copy this to your clipboard, as the API secret key will no longer be visible once you exit this screen.
To remove an API Key, locate the line that contains the API Key you wish to remove, and click the trashcan icon located to it's right. When prompted, confirm that you wish to delete the Auth Key.