Mxpanel.People.append_item

You're seeing just the function append_item, go back to Mxpanel.People module for more information.
Link to this function

append_item(client, distinct_id, property, item, opts \\ [])

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Specs

append_item(Mxpanel.Client.t(), String.t(), String.t(), String.t(), Keyword.t()) ::
  :ok | {:error, term()}

Appends the item to a list associated with the corresponding property name. Appending to a property that doesn't exist will result in assigning a list with one element to that property.

Mxpanel.People.append_item(client, "13793", "Items purchased", "socks")