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I would like to change the default error message when a transaction fails on the checkout page. right now it just says system error. this is too vague and I need to change this as customers are complaining. does anyone know where I can look to make this change in magento 2.1.7

  • you need to use plugin & override module-checkout/Model/PaymentInformationManagement.php – Yogesh Nov 9 '17 at 5:01
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Override this method and update the text as customers needed.

public function savePaymentInformationAndPlaceOrder(
    $cartId,
    \Magento\Quote\Api\Data\PaymentInterface $paymentMethod,
    \Magento\Quote\Api\Data\AddressInterface $billingAddress = null
) {
    $this->savePaymentInformation($cartId, $paymentMethod, $billingAddress);
    try {
        $orderId = $this->cartManagement->placeOrder($cartId);
    } catch (\Magento\Framework\Exception\LocalizedException $e) {
        throw new CouldNotSaveException(
            __($e->getMessage()),
            $e
        );
    } catch (\Exception $e) {
        $this->getLogger()->critical($e);
        throw new CouldNotSaveException(
            __('An error occurred on the server. Please try to place the order again.'),
            $e
        );
    }
    return $orderId;
}

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