Magento Cart Payment List API, Paypal Not Available

Hello,

Recently we were working on Magento API. Where we were implementing checkout process for a website using Magento platforms. Since we were integrating in third party website which was built on ASP.NET, we were using Magento API. Here we have faced an issue on Select Payment Method step, that Paypal was not coming in list. In this blog I am going to explain how to solve this issue.

Magento API cart_payment.list is the API we were using for this and Paypal was enabled but still were not getting it. The reason was because we were using Paypal Standard Checkout where user is redirected to Paypal website for Payment. Since API is called on backend and there is no UI for that, so there is no point of redirecting to site. Hence this Payment method was ignored in API. Check the following function in app/code/core/Mage/Checkout/Model/Cart/Payment/Api.php file.

/**
     * @param  $method
     * @param  $quote
     * @return bool
     */
    protected function _canUsePaymentMethod($method, $quote)
    {
        if (!($method->isGateway() || $method->canUseInternal())) {
            return false;
        }

        if (!$method->canUseForCountry($quote->getBillingAddress()->getCountry())) {
            return false;
        }

        if (!$method->canUseForCurrency(Mage::app()->getStore($quote->getStoreId())->getBaseCurrencyCode())) {
            return false;
        }

        /**
         * Checking for min/max order total for assigned payment method
         */
        $total = $quote->getBaseGrandTotal();
        $minTotal = $method->getConfigData('min_order_total');
        $maxTotal = $method->getConfigData('max_order_total');

        if ((!empty($minTotal) && ($total < $minTotal)) || (!empty($maxTotal) && ($total > $maxTotal))) {
            return false;
        }

        return true;
    }


Here as you can see It's checking if Payment method is Gateway or can be used internally. Since Paypal standard checkout can not be used in internally as user is redirected to Paypal site. So to solve this issue just comment following code in _canUsePaymentMethod function.

/*if (!($method->isGateway() || $method->canUseInternal())) {
            return false;
}*/

That's it and now cart_payment.list will return you Paypal in list. Please note ideally you have to override this code and should not change in core code.