/**
* Collect grand total address amount
*
* @param \Magento\Quote\Model\Quote $quote
* @param \Magento\Quote\Api\Data\ShippingAssignmentInterface $shippingAssignment
* @param \Magento\Quote\Model\Quote\Address\Total $total
* @return $this
*/
public function collect(\Magento\Quote\Model\Quote $quote, \Magento\Quote\Api\Data\ShippingAssignmentInterface $shippingAssignment, \Magento\Quote\Model\Quote\Address\Total $total)
{
$totals = array_sum($total->getAllTotalAmounts());
$baseTotals = array_sum($total->getAllBaseTotalAmounts());
$total->setGrandTotal($totals);
$total->setBaseGrandTotal($baseTotals);
return $this;
}