Custom payment methods are always available when using new Payment Provider Gateway

[t-heuser]

Preconditions (*)

1. Magento 2.3.4
2. A custom payment method created according to the instructions
3. The payment method must have an availability validator which always returns false

Steps to reproduce (*)

1. Get the available payment methods for a quote via MethodList::getAvailableMethods(). You can also use graphql as the resolver for the "available_payment_methods" field from a cart calls this method.

Expected result (*)

1. The method should not be available as the default validator always returns false.

Actual result (*)

1. The method is always available.

Cause of the problem

The cause of the problem is that Adapter::isAvailable() gets called from MethodList::getAvailableMethods(). The Adapter::isAvailable() method then tries to get the infoInstance as seen on line 290. If it's null it will not execute the availability validator from the validatorPool which would return false.
The infoInstance is ALWAYS null in this case as the method instance gets freshly created from it's factory. The MethodList::getAvailableMethods() sets the infoInstance AFTER it calls the Adapter::isAvailable() method. So there is no way the validator gets called when using the new Payment Provider Gateway.

I guess this issue was never found as all of magentos payment methods are using the deprecated AbstractMethod class. I think this should be fixed asap as the method MethodList::getAvailableMethods() MUST work for all payment methods, especially if they're implemented the way they should be and not with deprecated classes.

Possible workarounds

1. Create a patch for MethodList::getAvailableMethods() and move line 76 below line 74.
   This is definitly nothing I want to do as I have no idea about the side effects on other payment methods using the deprecated model.
2. Overwrite the Adapter::isAvailable() method and manually call the validator.
3. Add an observer for "payment_method_is_active" event.
   I will do this until this issue is fixed.

---

Please provide Severity assessment for the Issue as Reporter. This information will help during Confirmation and Issue triage processes.

• Severity: S0 - Affects critical data or functionality and leaves users without workaround.
• Severity: S1 - Affects critical data or functionality and forces users to employ a workaround.
• Severity: S2 - Affects non-critical data or functionality and forces users to employ a workaround.
• Severity: S3 - Affects non-critical data or functionality and does not force users to employ a workaround.
• Severity: S4 - Affects aesthetics, professional look and feel, “quality” or “usability”.

[m2-assistant]

Hi @oneserv-heuser. Thank you for your report.
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• Information on your environment
• Steps to reproduce
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[t-heuser]

I can confirm that this issue exists, but not on an vanilla instance because of the nature of the problem.

[m2-assistant]

Hi @engcom-Echo. Thank you for working on this issue.
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  Details

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[JeffersonTeixeira]

I reported this issue before It was closed with no solution:
#30211

[t-heuser]

@JeffersonTeixeira The classical stale-bot treatment

How did you fix it? Did you use the fix @ksenia-zlotin provided?

[t-heuser]

For anyone stumbling across this, here is a temporary solution:

<?php

declare(strict_types=1);

namespace Oneserv\B2BInvoice\Model\Method;

use Magento\Framework\App\Area;
use Magento\Framework\App\State;
use Magento\Framework\Event\ManagerInterface;
use Magento\Framework\Exception\LocalizedException;
use Magento\Payment\Gateway\Command\CommandManagerInterface;
use Magento\Payment\Gateway\Command\CommandPoolInterface;
use Magento\Payment\Gateway\Config\ValueHandlerPoolInterface;
use Magento\Payment\Gateway\Data\PaymentDataObjectFactory;
use Magento\Payment\Gateway\Validator\ValidatorPoolInterface;
use Magento\Payment\Model\Method\Adapter;
use Magento\Quote\Api\Data\CartInterface;
use Magento\Quote\Model\Quote;
use Psr\Log\LoggerInterface;

/**
 * Class B2BInvoice
 */
class B2BInvoice extends Adapter
{
    private State $state;

    /**
     * B2BInvoice constructor.
     *
     * @param ManagerInterface $eventManager
     * @param ValueHandlerPoolInterface $valueHandlerPool
     * @param PaymentDataObjectFactory $paymentDataObjectFactory
     * @param string $code
     * @param string $formBlockType
     * @param string $infoBlockType
     * @param State $state
     * @param CommandPoolInterface|null $commandPool
     * @param ValidatorPoolInterface|null $validatorPool
     * @param CommandManagerInterface|null $commandExecutor
     * @param LoggerInterface|null $logger
     */
    public function __construct(
        ManagerInterface $eventManager,
        ValueHandlerPoolInterface $valueHandlerPool,
        PaymentDataObjectFactory $paymentDataObjectFactory,
        string $code,
        string $formBlockType,
        string $infoBlockType,
        State $state,
        CommandPoolInterface $commandPool = null,
        ValidatorPoolInterface $validatorPool = null,
        CommandManagerInterface $commandExecutor = null,
        LoggerInterface $logger = null
    ) {
        parent::__construct(
            $eventManager,
            $valueHandlerPool,
            $paymentDataObjectFactory,
            $code,
            $formBlockType,
            $infoBlockType,
            $commandPool,
            $validatorPool,
            $commandExecutor,
            $logger
        );
        $this->state = $state;
    }

    /**
     * @inheritdoc
     * This is a temporary workaround for https://github.com/magento/magento2/issues/33869.
     * It sets the info instance before the method gets executed. Otherwise, the validator doesn't get called
     * correctly.
     */
    public function isAvailable(CartInterface $quote = null)
    {
        if ($quote === null) {
            return parent::isAvailable($quote);
        }
        /** @var Quote $quote */
        /*
         * This is needed to avoid issues when creating a new order via adminhtml. There is an error as the quote has
         * empty data and somewhere deep in magento it causes an issue.
         */
        try {
            if (
                $this->state->getAreaCode() === Area::AREA_ADMINHTML &&
                $quote->getDataByKey(Quote::KEY_STORE_ID) === null
            ) {
                return parent::isAvailable($quote);
            }
        } catch (LocalizedException $exception) {
            return parent::isAvailable($quote);
        }

        $this->setInfoInstance($quote->getPayment());
        return parent::isAvailable($quote);
    }
}

[m2-assistant]

Hi @engcom-Lima. Thank you for working on this issue.
In order to make sure that issue has enough information and ready for development, please read and check the following instruction: 👇

• 1. Verify that issue has all the required information. (Preconditions, Steps to reproduce, Expected result, Actual result).

  Details

  If the issue has a valid description, the label Issue: Format is valid will be added to the issue automatically. Please, edit issue description if needed, until label Issue: Format is valid appears.

• 2. Verify that issue has a meaningful description and provides enough information to reproduce the issue. If the report is valid, add Issue: Clear Description label to the issue by yourself.

• 3. Add Component: XXXXX label(s) to the ticket, indicating the components it may be related to.

• 4. Verify that the issue is reproducible on 2.4-develop branch

  Details

  - Add the comment @magento give me 2.4-develop instance to deploy test instance on Magento infrastructure.
  - If the issue is reproducible on 2.4-develop branch, please, add the label Reproduced on 2.4.x.
  - If the issue is not reproducible, add your comment that issue is not reproducible and close the issue and stop verification process here!

• 5. Add label Issue: Confirmed once verification is complete.

• 6. Make sure that automatic system confirms that report has been added to the backlog.

[engcom-Lima]

Hi @oneserv-heuser,

Thank you for reporting the issue.
Can you please provide more detailed 'Steps to reproduce' so that I can try to reproduce it ? If you can provide graphql steps to get the issue result, that would be helpful as well.

Also please update below information:

1. Is this issue reproducible on 2.4-develop instance also or is it specific to 2.3.4 ?
2. With which Payment Gateway you are currently facing this issue ?