When creating EFT transactions in batch, you are required to select a merchant account to process the credit cards.   Each merchant account has an option to use a 'Live' or Demo' processing mode.  Ensure the 'Live' process mode is selected for the merchant account being used to process credit cards in batch.
  1. Select Config > Business Rules
  2. Highlight Merchant Accounts
  3. Open the appropriate merchant account
  4. Select 'Live' as the process mode