If you're getting this error message, please contact Support and provide your Authorize.net login and password, as well as the answer to your secret question so that we can reset everything on both sides and check your cart.
You are in no way obligated to provide us with this information and you can change it as soon as we are done with the troubleshooting.
In the meantime, please set your cart to Manual Processing. Please see the related knowledge below for more details.
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