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JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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I have tested the widget on my end, generated a new API key and it worked fine:
What I would suggest you is go to your API keys section on Google, you can also click here https://console.developers.google.com/projectselector/apis/credentials, and create a new API key:
Please if even after resetting your API it does not work, let us know.