public function index()
{
$this->paymentRepository->reasonFilter('balance');
$balancePaidIn = $this->paymentRepository->getTotalAmount();
$this->paymentRepository->resetFilters();
$this->paymentRepository->sourceFilter('balance');
$balancePaidOut = $this->paymentRepository->getTotalAmount();
$balanceLiability = $balancePaidIn - $balancePaidOut;
$this->paymentRepository->resetFilters();
$this->paymentRepository->reasonFilter('storage-box');
$storageBoxLiability = $this->paymentRepository->getTotalAmount();
$this->paymentRepository->resetFilters();
$this->paymentRepository->reasonFilter('door-key');
$doorKeyLiability = $this->paymentRepository->getTotalAmount();
$laserCutterInvestment = $this->paymentRepository->getPaymentsByReference('laser-cutter')->sum('amount');
$laserCutterMoneySpent = $this->paymentRepository->getEquipmentFeePayments('laser')->sum('amount');
return \View::make('payment_overview.index')->with(compact('balancePaidIn', 'balancePaidOut', 'balanceLiability', 'storageBoxLiability', 'doorKeyLiability', 'laserCutterInvestment', 'laserCutterMoneySpent'));
}