I'm trying to test out my form for buying gift certificates and it isn't working

I'm receiving the same error message as in this thread: https://www.jotform.com/answers/2003502-Error-message-with-payments-in-Square-Sandbox-mode

and I've tried the trouble shooting they recommended and am still not succeessful. 

I have been checking your form and it seems to be correctly configured, searching for information about this issue, it seems to happen as well when you're using the wrong environment, for example, if your integration is set to live while you're account is configured as sandbox. 

Here's a link you may use as reference: https://www.sellercommunity.com/t5/Developer-Discussions/Card-nonce-not-found-in-this-production-application-environment/td-p/34336 

I would recommend you to kindly check that on your Square account is all correctly configured and it's set up to work on live mode. 

If the problem persists, let us know.