Mxpanel.People.set

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

set(client, distinct_id, properties, opts \\ [])

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Specs

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

Sets properties for a profile identified by its distinct_id. If the profile does not exist, it creates it with these properties. If it does exist, it sets the properties to these values, overwriting existing values.

properties = %{"Address" => "1313 Mockingbird Lane", "Birthday" => "1948-01-01"}
Mxpanel.People.set(client, "13793", properties)