Is there any way to have one form that accepts multiple payment types (credit card OR check)?

Hello!

I am interested in having one registration form that accepts credit cards but also where attendees can select a pay by check option. I have the Authorize.net payment widget enabled and set up. However, it doesn't look like I can add a purchase order widget for users to bypass the credit card option and mail a check. Does this mean I have to have two separate forms based on payment type? Thanks for any help!

You can easily achieve this with JotForm. You can create multiple payment form.

First, you will need to identify how many payment methods you would like to use. For your case, you will have a total of three forms. You can check and follow this walkthrough:

https://eu.jotform.com/help/182-How-to-Create-a-Basic-Multiple-Payment-Form

Please give it a try and let us know if you need any further assistance.