How do I switch to a different payment gateway?

Are you referring to this Redde payment?

https://www.reddepayments.com/

Unfortunately, this payment method is not yet available on our integrations list. You can check out our available list of payment integrations:

Guide: https://www.jotform.com/help/323-Mastering-Payment-Form-Integrations-with-JotForm

To be able to switch the Square integration from Square to PayPal. Please check this screencast:

Let us know if you have further questions.

Thanks.