Nostrum.Api.get_guild_ban

You're seeing just the function get_guild_ban, go back to Nostrum.Api module for more information.
Link to this function

get_guild_ban(guild_id, user_id)

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Specs

get_guild_ban(integer(), integer()) ::
  error() | {:ok, Nostrum.Struct.Guild.Ban.t()}

Gets a ban object for the given user from a guild.