If I have api key of Business API, i just want example of URL, like how to put the place id and api key.
If Google have authorized you to use Google Business API then you need to
Your Http Get request must have Access Token
For Example: https://mybusiness.googleapis.com/.../reviews??access_token={tokenHere}
this will return you all the reviews.
Ref: https://developers.google.com/my-business/reference/rest/v4/accounts.locations.reviews
Hope that answered your Question.