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Each request to the API must be authenticated with a valid API token. You can find both your public and secret API key in the API settings of your project. 
'Authorization': 'Bearer <team_token>'

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Public API Key

Your public API key should be used in environments like the browser or mobile apps.
ActionAllowed
Tracking Events✔️
Sending transactional emails✖
Retrieving contacts✖
Creating new contacts✖
Deleting contacts✖

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Secret API Key

Your secret API key should be used in environments like your backend server.
ActionAllowed
Tracking Events✔️
Sending transactional emails✔️
Retrieving contacts✔️
Creating new contacts✔️
Deleting contacts✔️
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