The verification failed error message is caused by a failure of Captcha.  We utilize Captcha on various areas of the website to enhance the overall website security.  However, from time to time Captcha will block real users unintentionally.  It means that the information you have submitted in your form maybe correct, but somehow your behavior on the website appears as suspicious.  This could occur if you attempt to process an order a few times in rapid succession or wait on the checkout page for too long, or if you wait to long while adding a payment method.  

Here are some common solutions;