Booking plugin to link with Google book a table button

Hi,
I start developping WordPress websites for a clientele of restaurants. I add functionnalities such as table booking to my service. I am willing to link the button “book a table” on their Google My Business listing to the booking plugin I use on their WP website but I found out Google requests to pass by one of their partners only (full list of Google partners here).
I am looking for a plugin that might be registered as a Google partner and preferably free or if you have a tip on how to process in order to link this button to my client booking system on his WP site?
Thank you for your help!