Getting an API Key from Google Cloud Platform is the first step before using any of the Google Maps API Services.
Log In to Google Cloud Platform.
You can log in to Google Cloud Platform using a gmail account.
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Create A Project
Then, go to Select a project ▾ drop-down menu, which will open up a dialog box with your existing projects, if any.
Choose the one that you want to obtain an API key from.
Otherwise, create a new project by clicking the NEW PROJECT button at the top right of the dialog box.
Create An API Key
Once the project is selected, go to the Navigation Menu button at the top left of the page, and choose APIs & Services → Credentials
Then, select Create Credentials → API Key, which will open up a dialog box with your API Key. 🔑