Did you mean the CIM validationMode from testmode to livemode?
From the documentation
testMode—performs field validation only. During field validation, all fields are checked.
However, fields with unrestricted field definitions (such as telephone number) do not
If you select testMode, a $1.00 test transaction is submitted to verify that the credit card
number is in a valid format using the Luhn MOD 10 algorithm. This test transaction does
not appear on the customer's credit card statement, but it will generate a transaction receipt
e-mail to the merchant.
liveMode—generates a transaction to the processor in the amount of $0.01 or $0.00. If
successful, the transaction is immediately voided. Visa authorization transactions are being
switched from $0.01 to $0.00 for all processors. All other credit card types use $0.01. We
recommend you consult your Merchant Account Provider before switching to Zero Dollar
Authorizations for Visa, because you may be subject to fees.
For Visa transactions using $0.00, the billTo address and billTo zip fields are required.
Also, there should be validationDirectResponse from the response that will have the detail of why you are getting E00027.