'Use token to Authenticate Users over WebSockets

I wonder how to setup the authentication something like token,

wss://demo.piesocket.com/v3/channel_1?api_key=**VCXCEuvhGcBDP7XhiJJUDvR1e1D3eiVjgZ9VRiaV**&notify_self

so I can have the api key. Where to setup the api key, is it in the config.yml or permission.yml or something else. Please help. Thank you

regards,

Johan



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