Please see my description here, thank you!
Best answer by danvers
View originalHi
Looks like there was an issue with your instance - the Zapier app was not enabled - sorry about that! → you can find your API key under Integrations > Apps > Zapier.
In case anyone is having trouble finding the correct API key when they’ve activated the Zapier app.
The API key that you need for Zapier isn’t in the API section of integrations. Go to the Apps section and click on Zapier. Click on the ‘Connect with Zapier’ tab there and you’ll see the API key.
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