Retrieve all portfolios for the authenticated user with asset details and quantities.
Auth0-issued access token that includes the scopes listed for the route.
MongoDB identifier of the user whose portfolio is being queried.
Array of user portfolios with holdings.
Portfolio unique identifier.
ISO currency code for the portfolio (e.g. EUR, GBP, USD).
Array of holdings with asset details and quantities.
Portfolio creation timestamp.
Last update timestamp.