Mindy is setting up her Google Merchant Center account and has to verify her website URL. Her website URL must begin with http:// or https://.

Explanation: Before you can upload product data to the Merchant Center for Google Shopping, you need to verify and claim your store’s website URL. Verification lets Google know that you are an authorized owner of a website URL.

Read more here: https://support.google.com/merchants/answer/176793