/**
* Check quote amount
*
* @param \Magento\Sales\Model\Quote $quote
* @param float $amount
* @return $this
*/
public function checkQuoteAmount(\Magento\Sales\Model\Quote $quote, $amount)
{
if (!$quote->getHasError() && $amount >= self::MAXIMUM_AVAILABLE_NUMBER) {
$quote->setHasError(true);
$quote->addMessage(__('This item price or quantity is not valid for checkout.'));
}
return $this;
}