Send email using gmail API using cron schedule laravel PHP

We want to send email using gmail api for that we are authenticating users for there gmail account and get full access for there gmail account.

Now we want schedule email sending as nightly task User select some client and save in our database now we want to send email to those email ids later.

As we users access token expire of gmail.How should we send email.

Regards Ashish Shukla

via Chebli Mohamed