Integration with Authorize.net is not working properly

Hi I have a form embedded into our site that allows for credit card processing which is attached to Authorize.net.  I was just told by a client that it is not working.  Is there a way to test it?

Url's are as follows:

http://www.jotform.com//?formID=42646901794261

http://www.jotform.com//?formID=42647626869269

and

http://www.jotform.com//?formID=42647466037258

It is embed here:

http://iqoffice.ca/services/virtual-offices/

Any help would be greatly appreciated.

Yes, you can test your payment integration using the sandbox mode. Please refer to this guide: https://www.jotform.com/help/221-How-to-Test-Authorize-net-Payment-Tool-on-Sandbox-Mode

Is this happening with just one of your clients? You can also check your incomplete payments to check more details about the received errors.

The error I saw on your website while testing is the following:

You should check the entered credentials in your payment integration to validate they're correct.

Let us know if you have further questions.
Thanks.