Filtering a Payment Method in Magento

When Magento is checking to see if a payment method is “available” it dispatches an event called payment_method_is_active passing in a StdClass that holds a local variable called isAvailable.

We only need to change this variable in our own custom logic to affect wether or not the method is available.

Here is how.

In your config.xml (assuming you already have a module set up)

...
<frontend>
    ...
    <payment_method_is_active>
        <observers>
            <filter_method>
                <type>singleton</type>
                <class>[vendor]_[modulename]/observer</class>
                <method>filterPaymentMethod</method>
            </filter_method>
        </observers>
    </payment_method_is_active>
    ...
</frontend>
...

In Model/Observer.php

<?php

class [Vendor]_[ModuleName]_Model_Observer
{
    public function filterPaymentMethod($observer)
    {
        $method = $observer->getEvent()->getMethodInstance();
        if ($method->getCode() === 'purchaseorder') {
            $result = $observer->getEvent()->getResult();
            // rediculousness
            // replace with goodness
            if (rand(1,10) == 5) {
                $result->isAvailable = false;
            }
        }
    }
}

Of course if (rand(1,10) == 5) { is absurd and only there to highlight how easy it is to affect the availability of a payment method.

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Filtering a Payment Method in Magento

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