Looking for an app to automatically merge unfulfilled orders?

Topic summary

Main issue: Automatically merging a follow-up add-on order into an existing unfulfilled order so both items ship together. Customers buy product A (with shipping), then minutes later buy add-on product B (no shipping). Backend struggles to match/merge because shipping method labels differ.

Constraints: Items are too low-cost to ship separately. Bundles/upsells already exist; need a solution for returning customers from email/retargeting.

Requested help: An efficient workflow or app to automatically merge such orders.

Proposed solution: A developer suggested the Shopify app Mergify. It can combine multiple orders into a single fulfillment without restocking, keeping inventory counts unchanged. It can automatically detect orders with the same customer and shipping address and merge them without manual intervention, aiming to lower shipping costs. Support is offered by the app team.

Status: No confirmation of adoption or outcome; the thread remains open.

Summarized with AI on January 8. AI used: gpt-5.

Hey guys, with my current store, I sell a main product and then a separate product that is an add-on to the first product. A customer would purchase product A (paid shipping), creating an order, then comes back 5 minutes later and purchase product B (no shipping because it is an add on). Now because product A hasn’t been fulfilled, it is ideal for the second order to automatically be merged into the first order and shipped together via the chosen shipping method. Currently, our backend is having a hard time finding and combining these orders because the shipping method is labeled differently.

No, we cannot ship them individually as they are too cheap.

Yes, we already have bundles and upsells however this is for customers that return from email marketing or retargeting.

I want to ask whats the most efficient way to do this or is there an app for something like this? Thanks

Hi @jasonzeyu ;
We’ve developed the Shopify app “Mergify” as a merger of orders, so the problem of merging orders can be solved easily. With Mergify, you can effortlessly combine multiple orders into a single order, all without the need to restock any items. Your inventory remains unchanged! By creating a combined order that includes all the necessary items for fulfillment, you can conveniently ship all the orders together to the customer at just once.
One of the remarkable features of Mergify is its ability to automatically identify orders with the same customer and shipping address, seamlessly merging them without any manual intervention. This automated process ensures that you can optimize your shipping operations and minimize costs. A growing number of stores are already benefiting from Mergify, enjoying significant savings on shipping costs.
We invite you to experience the convenience and cost-effectiveness of Mergify for yourself. If you have questions, our team is readily available to assist you.

Mergify | https://apps.shopify.com/bestapper-mergify
Merge & combine orders to save on shipping costs