What information do you need to enter in Google Merchant Center to create a Shopping campaign?
Local business data feed
Verified and claimed website URL
Before you can upload product data to Merchant Center for Google Shopping, you must verify and claim your store’s website URL. Verification lets Google know that you are an authorized owner of a website URL. Claiming associates the verified website URL with your Merchant Center account.
Read more here: https://support.google.com/merchants/answer/176793?hl=en