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I didn't see that error before so I'm not sure if it is coming from the integration or from the Square. Could you please provide the screenshot with Browser console opened when that error occurs.
Here is how to do that:
1. When you see the error right click and click Inspect:
2. Then click Console:
And post the screenshot here by following:
1. Go to this link: https://www.jotform.com/answers/1078736
2. Click this icon:
We'll wait for your response.
When I tried to connect it again today, it worked. My assumption would be that it was an error on Square's side.
Thank you for getting back to us with the information.
That is most probably the case.
Do not hesitate to contact us if you need any further assistance.