Error while placing order. Error 1: Payment error: Declined (2: This transaction has been declined.)

I am noticing a bunch of suspicious activity. Most are just phishing for entry points related to Wordpress. Then I am seeing this one more frequently over the past week.


The level of log entry.
Log level:  Error

The log entry message.
Short message:  Error while placing order.
Error 1: Payment error: Declined (2: This transaction has been declined.)

The details for the log entry.
Full message:  

IP address of the machine that caused the exception.
IP address:  66.87.148.3

Name of the customer who caused the exception.
Customer:  

Originating page of exception.Page
URL:  https://fiasfl.com/checkout/confirm

The referrer URL.
Referrer URL:  /checkout/confirm

Date/Time the log entry was created.
Created on:  12/6/2014 7:02:01 PM

What concerns me, there is no customer associated with the error. Is this a valid concern? If so what can I do?

I am running V. 3.4


Thanks!

That IP is in Florida, and the error looks legit (https://knowledgecenter.zuora.com/CA_Billing_and_Payments/M_Payment_Gateways/C_Managing_Payment_Gateways/A_Setting_Up_Payment_Gateways/C_Authorize.net_Gateway)