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How to secure API keys for Google Maps Platform | Google Cloud Blog
Starting September 16, 2019, API key restrictions will be enforced for the Places API. Any calls to the Places Library using API keys which don’t have the Places API in their list of authorized APIs will begin to receive errors.
API keys are the primary way we authenticate access to Google Maps Platform APIs and SDKs. Here's a rundown on the key restrictions available, best practices, and a video tutorial on how to restrict your keys.
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