How can I setup 2 payment gateways on a single form?

Is it possible to set up a JotForm to accept either PayPal or Square so that the customer can choose their form of payment?

You can not have more than 1 payment processor on a single form. So, as a workaround, you would need to create 3 forms in total:

1st Form: Primary form that will house the two forms

2nd Form: Will be your 1st payment method, Paypal

3rd Form: will be your 2nd payment method, Square 

For a more detailed instruction on how to go with this approach, kindly refer to the guide I'm linking below. The example on our guide uses PayPal and Purchase Order but the idea is still the same.

Complete guide: How-to-Create-a-Basic-Multiple-Payment-form