Nostrum.Api.add_pinned_channel_message-exclamation-mark

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

add_pinned_channel_message!(channel_id, message_id)

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Specs

add_pinned_channel_message!(
  Nostrum.Struct.Channel.id(),
  Nostrum.Struct.Message.id()
) :: no_return() | {:ok}

Same as add_pinned_channel_message/2, but raises Nostrum.Error.ApiError in case of failure.