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After logging in, select Settings >> API Keys >> You will see a list of API keys here.
Click on Create API Key utton button to create new API key to use on your phpFox site.
Depends on your requirements, you can set the permissions for your key appropriately.
Usually you should choose Full Access permission. Click on Create & View button to create the key.
If the key is created successfully, there will be a page to show the key.
Note the key down for later use.