title: Magento2 with WorldPay Payment Gateway, Getting error "Payment failed, please try again later EXT_67: Unexpected Error"
body: <p>I am using WorldPay payment method on my Magento2 store. I have tested it in the test environment and it's working as expected(Redirecting me to Worldpay site).
  Now, I have changed the mode/environment to live and it's not redirecting to the Worldpay site. I am getting this error on the checkout page as:
  "Payment failed, please try again later EXT_67: Unexpected Error".</p>
  
  <p>I am using WorldPay Paypal method.
  Please share your views here if you guys have faced this type of problem too.</p>
  
  <p>Thanks in advance!</p>