How Multiship Orders Handle Shipping Costs and Third-Party Apps

Multiship Checkout (also called multi-recipient checkout) lets your customers send gifts to multiple people in a single purchase. Because each recipient gets their own package shipped to their own address, shipping works a little differently than a standard single-destination order.

This article explains exactly how shipping costs are calculated, how your existing shipping setup carries over, and how popular third-party shipping apps fit into the picture — all without any engineering work on your end.

Before you start, make sure you have:

Every recipient in a multiship order gets their own shipping rate, calculated individually in real time. When a gifter adds a recipient and enters their shipping address, Zest queries Shopify's shipping API using that recipient's specific product basket and destination — the same way a standard Shopify checkout would.

A few things to know:

Free shipping thresholds — and any other shipping-level discounts — are evaluated at the individual recipient level, not against the order total.

This means: if your store offers free shipping on orders over $100, each recipient's portion must independently meet that $100 threshold to qualify. A gifter sending three $60 gifts ($180 total) would not receive free shipping on any of the three, because no single recipient's subtotal crosses the $100 threshold.

This is an important concept to keep in mind for your store's shipping promotions:

Gifters can select a different shipping method for each recipient during the Multiship Checkout flow.

Here's how it works:

Because each recipient is treated as an independent order, a gifter can choose overnight shipping for one recipient and standard ground for another in the same checkout.

Zest is compatible with third-party shipping rate apps that communicate through Shopify's Shipping API. Because Zest queries Shopify's API to retrieve rates, any app that integrates at that level will have its rates surfaced automatically in the Multiship Checkout.

Compatible apps (confirmed through Shopify's API):

Apps that may not be compatible:

Fallback option: If a third-party app isn't compatible, Shopify's native shipping profiles are a reliable fallback. Compatibility should be validated during your Zest implementation.

CalcuRates note: Some third-party shipping calculators may cause address validation errors during Multiship checkout. Since Zest relies on what Shopify returns, conflicts may appear as Shopify rejecting addresses. If you see this, investigate the shipping app's own address validation logic.

Zest marks each line item in a multiship order with a special attribute so your shipping apps can identify them programmatically.

Third-party shipping rate providers (like PDQ) can use this attribute to show or hide specific shipping methods for multi-recipient orders.

For example, you can configure PDQ to detect _zest:multiship on line items and suppress pickup or local delivery options that don't make sense for multi-address shipments.

Pickup and local delivery options don't make sense for multi-address orders. There are a few ways to hide them:

Shipping insurance and order protection apps create complexity in multiship orders because these apps typically calculate their price based on the total cart value — but in multiship orders, the cart is split across different Child Orders, one per recipient.

Two supported approaches:

Route and auto-selected insurance: If you use Route (or a similar app) with auto-selection enabled, the Route SKU is added to the cart automatically as a digital product. Because Zest detects digital products in the cart, this can prevent the multi-recipient option from appearing. Disabling Route's auto-selection resolves this but may reduce attachment rates. Work with Zest and your insurance provider to find the right balance.
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Order Protection apps (e.g., Order Protection): Apps that calculate protection fees based on the total cart value will produce a mismatch in multi-recipient orders. The short-term solution is to hide the protection app from the multiship flow. A per-recipient API integration for insurance calculation is not yet available.

Launching multiship from the cart with insurance: If you launch the multiship checkout from the cart page (rather than from Shopify's checkout), insurance requires additional coordination. Work with your insurance provider and Zest to ensure the insurance variant is correctly added before navigating to the multiship URL.

Estimated delivery dates may not always appear in multiship checkout, and this is a Shopify API constraint — not a limitation of Zest.

Here's why: Shopify's Shipping API returns the shipping method name and price to Zest, but it does not expose the delivery promise or estimated arrival date that third-party apps attach as secondary information.

Workarounds:

ZIP-code-based delivery calendars: If your store uses a delivery date calendar that varies by ZIP code (e.g., for perishable products with different lead times by region), a single calendar widget will not work in multiship checkout because each recipient has a different ZIP code. A per-recipient approach is needed. Contact Zest support to discuss options for your use case.