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Credit Card Payment Error “An error occured on the server. Please try to place the order again."

Credit Card Payment Error “An error occured on the server. Please try to place the order again."

Magento 2.1.7 

 

I have both Braintree and Authorize.net merchant accounts. Neither one can I get to work properly to checkout. I can verify that when using Authorize.net direct post that my cart is making a connection to their server and authorizing the card successfully. However, I get this error and the customer is not taken from the payment screen. An order # is generated, but it's a pending type order and the customer does not receive a successful order email, etc.

The same thing happens when I try and use my Braintree credit card checkout. Card verification is successful but no order # is created, customer receives same error message and is left on the payment page.