I am trying to add an authorize.net paymnet form to my website. Do I use SIM, AIM or direct post method?

Hi,

I am not quite sure what you mean, but would like to direct you to few of our guides that will explain in details how to setup the integration between your jotform and Authorize.net through our Authorize.net payment processing widget.

Order Form Basics

How to Test Authorize.net Payment Tool on Sandbox Mode?

In case they do not answer your question, please give us more details to what you mean with the jotform in question.

Best Regards,
Ben