Knock.Users.set_channel_types_preferences

You're seeing just the function set_channel_types_preferences, go back to Knock.Users module for more information.
Link to this function

set_channel_types_preferences(client, user_id, channel_types, options \\ [])

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Specs

set_channel_types_preferences(Knock.Client.t(), String.t(), map(), Keyword.t()) ::
  Knock.Api.response()

Sets the channel type preferences for the user.