Hello,
First of all, thank you for your purchase.
To start using the plugin, you need to enable the Google My Business API in the Google Developer Console. To do so, please go to this link and enable the API used in project 572307354338: https://console.developers.google.com/apis/api/mybusiness.googleapis.com/overview?project=572307354338
Please note that to be able to activate this API, you need to be approved for it. Please check this video for details on how to get approved (steps shown): https://www.youtube.com/watch?v=tsR4a9OdHLs&t=129s
You can access the request for which needs to be filled up, here: https://developers.google.com/my-business/content/prereqs#request-access
Regards, Szabi – CodeRevolution.