Enable the Google API. Once you received the email from Google saying you were approved, you need to enable your Google API. Enter the basic setup linked in the confirmation email, see below.
Note: if you’ve got an existing project with the Google My Business API approved for it, use that one. Do not create a new one. Google My Business will only allow access to the API for one project.
Use the first project that you applied with
Please follow these instructions to enable it.
If you cannot find google my business API click on this link https://console.cloud.google.com/apis/library/mybusiness.googleapis.com
Enable this APIs
My Business Business Information API
My Business Notifications API
My Business Account Management API
My Business Q&A API
My Business Verifications API
(if you don’t know how to do that click here)