I perfectly configured the authorize.net and when I place order I get the error as "Invalid request. Please check your formatting."
I have also checked the currency format in both payment method currency, and accepted currency and both are fine.
I also tried by using other cards like visa, discover ,jcb, etc but I get the same error.
When I see in the unsettled payment reports in the sandbox account no payment transactions are visible.
The above image shows the error when "place order" button is pressed.