To enable Address Verification you will need to obtain a Google Cloud API Key, enter it into the Google Address Verification API Key field in your Website Options page, and Save your changes.
Obtaining an API Key
You may already have a Google Cloud API account as a part of enabling your website's Google Maps functions. We recommend using a separate Google Cloud API Key for the Address Verification function. This allows for separation and tracking in billing for your account. See documentation on setting up different API keys here:
https://developers.google.com/maps/documentation/address-validation/get-api-key
If your club does not have an existing Google Cloud API account set up, You can learn more about setting up your Google Cloud API account here: https://developers.google.com/maps/documentation/address-validation/cloud-setup
Once you have a Google Cloud API account set up you will need to endure that you have the Google Address Verification API activated for your account.
The Google Address Verification API key should be restricted to your club's domain name and and ClubExpress subdomain name (i.e. myclub.com and myclub.clubexpress.com).