YQ Extension Public is our internal extension suite for Shopify. It packages checkout and storefront capabilities that we roll out across YQ brand stores. The first included capability is cart and checkout validation that blocks PO Box shipping addresses. After install, activate the rule under Settings > Checkout > Checkout rules. More extensions can be added to this same app over time without installing separate apps.

• Unified app for multiple YQ Shopify extensions
• PO Box shipping address validation at checkout
• Server-side checkout rules that customers cannot bypass Designed for multi-store