GET_ENTITY_COORDS

GetEntityCoords(entity)

Citizen.InvokeNative(0x1647F1CB, entity)

local function ShowCoordinates()
    local player = source
    local ped = GetPlayerPed(player)
    local playerCoords = GetEntityCoords(ped)

    print(playerCoords) -- vector3(...)
end

RegisterNetEvent("myCoordinates")
AddEventHandler("myCoordinates", ShowCoordinates)

onNet('myCoordinates', () => {
  const player = global.source; // use (global as any).source for Typescript
  const ped = GetPlayerPed(player);
  const [playerX, playerY, playerZ] = GetEntityCoords(ped);

  console.log(`${playerX}, ${playerY}, ${playerZ}`);
});

using static CitizenFX.Core.Native.API;
// ...

// In class constructor
EventHandlers["myCoordinates"] += new Action<Player>(ShowCoordinates);

// Delegate method
private void ShowCoordinates([FromSource]Player player) {
    Vector3 playerCoords = GetEntityCoords(player.Character);

    // or the preferred use of C# wrapper
    Vector3 playerCoords = player.Character.Position;

    Debug.WriteLine($"{playerCoords}");
}