I'm trying to figure out how to create shopping campaigns in the sandbox. I've created my sandbox account and I'm able to create search campaigns, but not shopping campaigns. So I clicked on "Merchant Center" and started creating a store. But on the store creation page, there's no way to enter a "Destination URL", which appears to be a required setting since I am unable to save the store on that page. How do I setup a store in the sandbox? As this is a sandbox account, I do not want to modify production code in order to "claim" the URL for the sandbox.
Update: 5 days later - I tried the UET anyway - twice - but both say unverified still, which might be normal for the sandbox, I don't know. I've tried creating a merchant center store in multiple browsers on multiple days just in case there was just something weird going on - no luck there either. I'm still trying to figure out how to test shopping campaigns in the sandbox.