Recommended GTM setup for international ecommerces
1. Google Consent Mode V2
2. Analytics and Ad Vendor's Server Side tracking
3. Load GTM from your root domain
4. Send data to your root domain
5. GA4 E-commerce Data Layer in the website
5.1. Events: View_item, view_item_list, select_item, add_to_cart, view_cart,begin_checkout, add_shipping_info, add_payment_info, purchase
5.2. Parameters: items, value, currency, transaction_id
6. Deliver Ads to all the vendors you can via server-side
7. Create an internal User ID and use it across Analytics and Ad Vendors
8. Enhance all conversions: Send user-provided consented data
Benefits
1. Comply with international laws
2. Increase device tracking coverage
3. Feed Vendors algorithms with quality data
4. Get great data to do analytics
5. More Sales