Google Business Profile API n8n setup without gmail account

[agentcia]

Hi,

i'm trying to connect a client to a n8n automation that responds to client reviews of their businessess. The problem is that since i don't have access to their gmail account i can't sign in after i've created the Client Oauth credentials ( with their account through sharing screen ).

I have the option of going there and initiating the account wich would grant me access for 7 days, after that this message appears:

The provided authorization grant (e.g., authorization code, resource owner credentials) or refresh token is invalid, expired, revoked, does not match the redirection URI used in the authorization request, or was issued to another client.

How can I avoid the problem and not have to sign in again with their gmail account ( wich fixes that problem but I can't be doing that every week )?

Is there any way of maybe doing HTTP requests to get a new token every time so it doesn't expire, of course the google business profile api credential doesn't have a place for a refresh token so doing an http request is what I think would let me have the same result as the api but be able to include the refresh token obtained in an http.

Thanks in advance.

Marc