function PlayerIdentifier(type, id)
    local identifiers = {}
    local numIdentifiers = GetNumPlayerIdentifiers(id)

    for a = 0, numIdentifiers do
        table.insert(identifiers, GetPlayerIdentifier(id, a))
    end

    for b = 1, #identifiers do
        if string.find(identifiers[b], type, 1) then
            return identifiers[b]
        end
    end
    return false
end

TRIGGER IT LIKE THIS

local identifier = PlayerIdentifier('steam', players_server_id)

NOTE YOU ARE TRIGGERING CLIENT EVENTS. YOU CAN ONLY GET THE IDENTIFIER ON THE SERVER.

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