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Genius Sports APIs use OAuth2 (client_credentials) and API Keys (in headers) for authentication.
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Before accessing any API, you have to authorize and get a token with your issued client credentials. All Genius Sports APIs use the same authorization endpoints, based on the environment you want to access:
https://uat.auth.api.geniussports.com/oauth2/token (User Acceptance environment)
https://auth.api.geniussports.com/oauth2/token (Production environment)
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