I am using Ninja Form and I've triple-checked the API and Transaction Key and the live mode both on the website and on Authorize.net. Sandbox works perfectly. When I switch to Live, I just get a "The transaction was unsuccessful" message.
@POLdave17, this sounds like E00027, check the errorCode for more details or share the raw response (minus any sensitive details) someone maybe be able to pinpoint the cause.
