Returns JSON for a client event on channel sending data

Specs

subscribe(binary()) :: binary()

Return a JSON for a subscription request using the channel name as parameter

Return a JSON for a subscription request using the private channel, socket_id and the credential

Return a JSON for a subscription request using the presence channel, socket_id, the credential and the user

Specs

unsubscribe(binary()) :: binary()

Return a JSON for a unsubscription request using the channel name as parameter