CheapestMethodDeferredChooser.php

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<?php
namespace Magento\InstantPurchase\Model\ShippingMethodChoose;

use Magento\Quote\Model\Quote\Address;
use Magento\Quote\Model\Quote\Address\Rate;

class CheapestMethodDeferredChooser implements DeferredShippingMethodChooserInterface
{
    const METHOD_CODE = 'cheapest';

    public function choose(Address $address)
    {
        $address->setCollectShippingRates(true);
        $address->collectShippingRates();
        $shippingRates = $address->getAllShippingRates();

        if (empty($shippingRates)) {
            return null;
        }

        $cheapestRate = $this->selectCheapestRate($shippingRates);
        return $cheapestRate->getCode();
    }

    private function selectCheapestRate(array $shippingRates) : Rate
    {
        $rate = array_shift($shippingRates);
        foreach ($shippingRates as $tmpRate) {
            if ($tmpRate->getPrice() < $rate->getPrice()) {
                $rate = $tmpRate;
            }
        }
        return $rate;
    }
}