A new survey has found that unexpectedly high shipping fees are the number one reason consumers abandon online purchases. Checkout abandonment is a significant challenge for online merchants, with an estimated two out of every three consumers failing to pay for items they put in their shopping carts. The study conducted by PayPal and comScore also revealed that many consumers abandon their purchases for payment-related reasons. Of those surveyed, more than one in five shoppers didn’t complete purchases because their preferred payment option was not offered on the merchant’s Web site. Many shoppers simply think it is too much of a hassle to search for their wallets or purses – 21% did not complete online purchases because their wallets were not easily accessible.