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I want to remove the below lines in MagentoQuoteModelPaymentMethodManagement model file

 if (!$this->zeroTotalValidator->isApplicable($payment->getMethodInstance(), $quote)) {

            throw new InvalidTransitionException(__('The requested Payment Method is not available.'));

        }

In PaymentMethodManagement file:

<?php

/**

 * Copyright © Magento, Inc. All rights reserved.

 * See COPYING.txt for license details.

 */

namespace MagentoQuoteModel;



use MagentoFrameworkExceptionStateInvalidTransitionException;



/**

 * Class PaymentMethodManagement

 */

class PaymentMethodManagement implements MagentoQuoteApiPaymentMethodManagementInterface

{

    /**

     * @var MagentoQuoteApiCartRepositoryInterface

     */

    protected $quoteRepository;



    /**

     * @var MagentoPaymentModelChecksZeroTotal

     */

    protected $zeroTotalValidator;



    /**

     * @var MagentoPaymentModelMethodList

     */

    protected $methodList;



    /**

     * Constructor

     *

     * @param MagentoQuoteApiCartRepositoryInterface $quoteRepository

     * @param MagentoPaymentModelChecksZeroTotal $zeroTotalValidator

     * @param MagentoPaymentModelMethodList $methodList

     */

    public function __construct(

        MagentoQuoteApiCartRepositoryInterface $quoteRepository,

        MagentoPaymentModelChecksZeroTotal $zeroTotalValidator,

        MagentoPaymentModelMethodList $methodList

    ) {

        $this->quoteRepository = $quoteRepository;

        $this->zeroTotalValidator = $zeroTotalValidator;

        $this->methodList = $methodList;

    }



    /**

     * {@inheritdoc}

     */

    public function set($cartId, MagentoQuoteApiDataPaymentInterface $method)

    {

        /** @var MagentoQuoteModelQuote $quote */

        $quote = $this->quoteRepository->get($cartId);



        $method->setChecks([

            MagentoPaymentModelMethodAbstractMethod::CHECK_USE_CHECKOUT,

            MagentoPaymentModelMethodAbstractMethod::CHECK_USE_FOR_COUNTRY,

            MagentoPaymentModelMethodAbstractMethod::CHECK_USE_FOR_CURRENCY,

            MagentoPaymentModelMethodAbstractMethod::CHECK_ORDER_TOTAL_MIN_MAX,

        ]);

        $payment = $quote->getPayment();



        $data = $method->getData();

        $payment->importData($data);



        if ($quote->isVirtual()) {

            $quote->getBillingAddress()->setPaymentMethod($payment->getMethod());

        } else {

            // check if shipping address is set

            if ($quote->getShippingAddress()->getCountryId() === null) {

                throw new InvalidTransitionException(__('Shipping address is not set'));

            }

            $quote->getShippingAddress()->setPaymentMethod($payment->getMethod());

        }

        if (!$quote->isVirtual() && $quote->getShippingAddress()) {

            $quote->getShippingAddress()->setCollectShippingRates(true);

        }



        if (!$this->zeroTotalValidator->isApplicable($payment->getMethodInstance(), $quote)) {

            throw new InvalidTransitionException(__('The requested Payment Method is not available.'));

        }



        $quote->setTotalsCollectedFlag(false)->collectTotals()->save();

        return $quote->getPayment()->getId();

    }}

How to do this.
Thanks.

You can do it by using Preference in your di.xml file of your custom module.

<?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="MagentoQuoteModelPaymentMethodManagement" type="vendormoduleModelPaymentMethodManagement" />



</config>

Steps to Follow :

• Override di.xml


• Override PaymentMethodManagement.php


• Launch SSH and Run Commands

Override di.xml

app/code/Namespace/Modulename/etc

<?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="MagentoQuoteModelPaymentMethodManagement" type="NamespaceModulenamePaymentMethodManagement" />

   </config>

Override PaymentMethodManagement.php

/**

* {@inheritdoc}

*/

public function set($cartId, MagentoQuoteApiDataPaymentInterface $method)

{

    /** @var MagentoQuoteModelQuote $quote */

    $quote = $this->quoteRepository->get($cartId);



    $method->setChecks([

        MagentoPaymentModelMethodAbstractMethod::CHECK_USE_CHECKOUT,

        MagentoPaymentModelMethodAbstractMethod::CHECK_USE_FOR_COUNTRY,

        MagentoPaymentModelMethodAbstractMethod::CHECK_USE_FOR_CURRENCY,

        MagentoPaymentModelMethodAbstractMethod::CHECK_ORDER_TOTAL_MIN_MAX,

    ]);

    $payment = $quote->getPayment();



    $data = $method->getData();

    $payment->importData($data);



    if ($quote->isVirtual()) {

        $quote->getBillingAddress()->setPaymentMethod($payment->getMethod());

    } else {

        // check if shipping address is set

        if ($quote->getShippingAddress()->getCountryId() === null) {

            throw new InvalidTransitionException(__('Shipping address is not set'));

        }

        $quote->getShippingAddress()->setPaymentMethod($payment->getMethod());

    }

    if (!$quote->isVirtual() && $quote->getShippingAddress()) {

        $quote->getShippingAddress()->setCollectShippingRates(true);

    }

    /*** Do stuff with this code ***/

    if (!$this->zeroTotalValidator->isApplicable($payment->getMethodInstance(), $quote)) {

        throw new InvalidTransitionException(__(''));

    }

    /*** Do stuff with this code ***/



    $quote->setTotalsCollectedFlag(false)->collectTotals()->save();

    return $quote->getPayment()->getId();

}

Launch SSH and Run Commands

php bin/magento setup:di:compile

php bin/magento cache:clean

php bin/magento cache:flush

I hope it helps!

in you 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="MagentoQuoteModelPaymentMethodManagement" type="VendorModuleModelRewriteQuotePaymentMethodManagement" />



</config>

in your Model file

<?php 

 namespace VendorModuleModelRewriteQuote;



        class PaymentMethodManagement extends MagentoQuoteModelPaymentMethodManagement

        {

            public function set($cartId, MagentoQuoteApiDataPaymentInterface $method)

            {

                /** @var MagentoQuoteModelQuote $quote */

                $quote = $this->quoteRepository->get($cartId);



                $method->setChecks([

                    MagentoPaymentModelMethodAbstractMethod::CHECK_USE_CHECKOUT,

                    MagentoPaymentModelMethodAbstractMethod::CHECK_USE_FOR_COUNTRY,

                    MagentoPaymentModelMethodAbstractMethod::CHECK_USE_FOR_CURRENCY,

                    MagentoPaymentModelMethodAbstractMethod::CHECK_ORDER_TOTAL_MIN_MAX,

                ]);

                $payment = $quote->getPayment();



                $data = $method->getData();

                $payment->importData($data);



                if ($quote->isVirtual()) {

                    $quote->getBillingAddress()->setPaymentMethod($payment->getMethod());

                } else {

                    // check if shipping address is set

                    if ($quote->getShippingAddress()->getCountryId() === null) {

                        throw new InvalidTransitionException(__('Shipping address is not set'));

                    }

                    $quote->getShippingAddress()->setPaymentMethod($payment->getMethod());

                }

                if (!$quote->isVirtual() && $quote->getShippingAddress()) {

                    $quote->getShippingAddress()->setCollectShippingRates(true);

                }

                /*** Do stuff with this code ***/

                if (!$this->zeroTotalValidator->isApplicable($payment->getMethodInstance(), $quote)) {

                    throw new InvalidTransitionException(__(''));

                }

                /*** Do stuff with this code ***/



                $quote->setTotalsCollectedFlag(false)->collectTotals()->save();

                return $quote->getPayment()->getId();

            }



        }