Approving "ask to buy" requests from windows desktop.

I have an Android phone. My husband has an iphone and my 10-year-old has an ipad. My husband is extremely technologically adverse. I created an Apple ID account to access through my windows desktop. I used my husband's phone to set up family sharing and my 10-year-old's ipad is set up with "ask to buy". Husband is Orgnaizer and I am Parent/Guardian. How do I approve the ask to buy requests? If it's through email notifications, I'm not seeing the requests. I also don't see how to approve the requests through the Apple account.