Bangalore fashion brands and Mumbai marketplace sellers keep running into the same wall: Amazon Seller Central says one number, Shopify says another, GA4 disagrees with both, and Meta Ads Manager is off in its own world claiming credit for everything. If you're piecing together ecommerce analytics for Bangalore Mumbai brands from four different login screens, you already know the problem this post is about. You don't need someone explaining why data matters. You need to know which platform actually fixes it.