To use Google My Business API Key. You need register with Google to they approved and open this api on your Goolge Api App

Go to this link to register: https://docs.google.com/forms/d/e/1FAIpQLSfC_FKSWzbSae_5rOpgwFeIUzXUF1JCQnlsZM_gC1I2UHjA3w/viewform

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1. Go to website Google Console API: https://console.developers.google.com

2. Create a Google API APP

3. Enable Google My Business API

4. Create Googe API Key

5. Config OAuth consent screen 

6. Create Oauth Client ID