Registry sync, how deep can Babylist, Amazon Baby Registry, and Target Registry integration go?

Three tiers, depending on partner:

• Babylist (~3M active US registries, the dominant player), native partnership program with a product-feed API. You submit your SKU catalog as a CSV / JSON feed; Babylist ingests + makes your products natively addable to any registry. The Babylist “Add to Babylist” button embeds on your PDP via a Magento widget. Two-way: when a product is purchased through Babylist, the partner gets paid (Babylist takes ~7% commission); when stock changes on your Magento, the feed updates. Approval takes 4-8 weeks; not all brands qualify.
• Amazon Baby Registry, the universal “Add to Amazon” button works on any PDP via deep-link. For deeper integration, you’d list the SKU on Amazon Marketplace + tag it as registry-eligible. Amazon registry is hugely popular but cannibalises your DTC margin (Amazon fees 8-15% + you lose customer data).
• Target Registry, product-feed integration similar to Babylist but smaller registry user base. Same universal-button pattern works.
• MyRegistry, the catch-all universal registry. Their button works on any retailer’s site (including yours) and lets users add your SKUs to a universal registry that aggregates across retailers. Cheapest to integrate.

On the Magento side: registry dashboard CMS page for logged-in customers showing what’s been bought from their registries across all four. Plus a “buy from registry” deep-link from email reminders the customer sends to her network. Grandparents convert at 3-5x DTC traffic for registry purchases, this is where the real revenue is.