I'm implementing product price calculation based on a formula that uses customizible options in Magento 2 (ver. 2.3.1). I added some code to _applyOptionsPrice() to "Magento/Catalog/Model/Product/Type/Price.php and it works like a charm. Now I want to take my code out of magento code, and implement it as an custom module, but as much as I try I can not get it to work as it's suppose to do.

Here is my code:

in app/code/ABPPRK/ModulePrice/registration.php:



in app/code/ABPPRK/ModulePrice/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\Catalog\Model\Product\Type\Price" type="ABPPRK\ModulePrice\Model\Price" />


<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Module/etc/module.xsd">
    <module name="ABPPRK_ModulePrice" setup_version="1.0.1"></module>

And finally app/code/ABPPRK/ModulePrice/Model/Price.php:

 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
namespace ABPPRK\ModulePrice\Model;

class Price extends \Magento\Catalog\Model\Product\Type\Price 

    public function getFinalPrice($qty, $product)

        return 0;


Of course the return of the method to override (getFinalPrice) should not be that one. This is just a simple implementation to test with xdebug that does not work, as neither the real code.

There are no errors during "bin/magento setup:di:compile". And I can tell that command is considering my module because at some past point it gave the error:

"Warning: Declaration of ABPPRK\ModulePrice\Model\Price::getFinalPrice() should be compatible with Magento\Catalog\Model\Product\Type\Price::getFinalPrice($qty, $product)"

What is missing here? I've followed all the tutorials I've found about overriding class methods but Iven't found anyone specific for this method. :-(

Thanks in advance, Armando.

2 Answers 2


I think you need to add sequence in module.xml , may be you need to load catalog and sales modules before your's


You need to use

public function getFinalPrice(Magento\Catalog\Model\Product\Type\Price $price, $qty, $product)

as your function signature.

The first argument when injecting functions in magento is always the subject class, so you can call the subject classes functions.

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