G Suite is the new name for Google Apps.
After you sign up with G Suite, Google provides you the verification code in the G Suite Setup Wizard (on the Verify your domain and set up email page). See screenshot below.
You will need to verify your domain name so that you can use Google Apps and for your emails to work.
Domain verification process will include adding your verification code and updating your domain's MX mail server records to point to Google.
On the above screenshot, "Verify your domain and set up email" page, click the "Choose a different method" drop-down list and select Add a domain host record (TXT or CNAME).
The setup steps are as follows:
We will describe each step in detail below.
After you choose the Add a domain host record (TXT or CNAME) option, you will see the verification code which looks like this:
google-site-verification= [followed by a unique string of text and numbers]
Please make sure to copy the whole verification code from google-site-verification (entire string of text and numbers).
Please follow the steps below on how to add the TXT record to your domain in Plesk:
You will now need to set up various DNS records in Plesk in order to configure your domain's mail to be routed to Google's servers.
Given that your domain's nameservers are already pointing to our network, here are the steps on how to update your domain's MX mail server records in Plesk:
Once the default MX record has been removed, you will need to add new MX records with the values below (note: these values may change so please refer to Google's own G Suite setup instructions for the current/up-to-date values):
Click Add Record
Please note that any DNS changes that you make may take a few hours to take effect and fully propagate.
To complete the domain verification process, you need to tell Google to verify your domain.
Please note that TXT record changes can take up to 24 to 48 hours to propagate, but it usually takes effect much quicker (eg within 1-2 hours).
After domain verification, you can then start using Gmail, Drive, and all the other services included with your G Suite account.