Override Shipping Price in Magento 2

Question

Is there any way to override Shipping Price by Special User (Customer Service Team) when they place an order for the customer.

I want to add a text box for the Custom Shipping price which will override existing shipping cost to quote when user will go to the next step.

For Example, I want to make 46.53 to 40.

Answer 1

First, I think you should set the price to depend on the customer inputed.

with function setPrice of \Magento\Quote\Model\Quote\Address\RateResult\Method

The solution is plugin to Magento\Quote\Model\Quote\Address\RateResult\Method and change value of price before set to data['price'];

di.xml

<type name="Magento\Quote\Model\Quote\Address\RateResult\Method">
        <plugin name="namespace_change_price_of_shipping_rate" type="NameSpace\Module\Plugin\Model\Quote\Address\RateResult\Method"/>
</type>

NameSpace\Module\Plugin\Model\Quote\Address\RateResult\Method

namespace NameSpace\Module\Plugin\Model\Quote\Address\RateResult;

class Method
{

      protected $_customerSession;
    public function __construct(
        \Magento\Customer\Model\Session $customerSession)
    {
        $this->_customerSession = $customerSession;
    }


    /**
     * Round shipping carrier's method price
     *
     * @param string|float|int $price
     * @return $this
     */
    public function beforeSetPrice($subject, $price)
    {
        // @TODO returun inputed price
        return $price;
    }


    public function beforeSetCost($subject, $price)
    {
        // @TODO returun inputed price.
        return $price;
    }

    public function beforeSetData($subject, $key, $value){
        if('price' == $key || 'cost' == $key){
                //@TODO set inputed price to value
        }
        return [$key, $value];
    }
}

2: Edit your vendor/magento/module-checkout/view/frontend/web/template/shipping-address/shipping-method-item.html:16 file to Add an input for input custom price

<input type="text" attr="'value': customPrice "/>

3: Edit shipping javascript file vendor/magento/module-checkout/view/frontend/web/js/view/shipping.js to add a function that appends custom price to shipping data.

    selectShippingMethod: function (shippingMethod) {
        selectShippingMethodAction(shippingMethod);
        checkoutData.setSelectedShippingRate(shippingMethod['carrier_code'] + '_' + shippingMethod['method_code']);
        /** @TODO store custom input data to somewhere 
         * for  NameSpace\Module\Plugin\Model\Quote\Address\RateResult\Method 
         * can get and set to value of variable **price** */
        return true;
    },

Answer 2

You need to do code like this. We take example that, you need to price into carrier called "Tablerate".

1. we need to create di.xml at following location.

[Vendor]/[Extension]/etc/di.xml

    <?xml version="1.0"?>
    <config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
          <preference for="Magento\OfflineShipping\Model\Carrier\Tablerate" type="Vendor\Extension\Model\Carrier\Tablerate" />
    </config>

2. create our logic file here.

[Vendor]/[Extension]/Model/Carrier/Tablerate.php

<?php
namespace Vendor\Extension\Model\Carrier;

use Magento\Quote\Model\Quote\Address\RateRequest;

class Tablerate extends \Magento\OfflineShipping\Model\Carrier\Tablerate
{
    public function collectRates(RateRequest $request)
    {
        //Do your logic before this line and return your custom price.
        $method->setPrice($shippingPrice);
    }
}