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This guide explains how to add or remove products to/from a customer’s subscription. It covers two common use cases: adjusting products after a plan change, and adding additional products (add-ons) to an existing subscription.
Note: Depending on your project configuration, the sidebar may show this page as Subscriptions or Customers. The functionality is the same in both cases.

Adjust Products After a Plan Change

If a customer changed their plan (see Change the active plan of a subscription for more details), you may also want to adjust the products that came with that plan change.

Steps

  1. Go to Customers and look for the customer
  2. Scroll down to the Active Products section
active_products A product already on the subscription that has since become unavailable or, when your project treats out-of-stock Shopify products as unavailable for new orders, gone out of stock, shows a red Unavailable or Out of stock label next to it in this list.

To Add a Product

  1. Click on Add product in the top right
  2. Choose the product to add from the dropdown. You can search and select any available product in your project. Products that are not allocated to the subscription’s plan group are labeled “Not eligible for this subscription’s plan” in the search results. When you select such a product, a warning appears—you can still add it manually, but customers won’t be able to add it themselves in the Self Service Center. If you need to make the product available to customers, you can update the plan group eligibility for that product. When Treat out-of-stock Shopify products as unavailable for new orders is enabled, products with no Shopify stock remain available to staff in this dropdown and are labeled Out of stock. This lets you make an intentional exception for an existing subscription. Adding the product does not change its stock status: customers still cannot add or swap to it in the customer portal, and your configured unavailable-product order behavior still applies.
  3. Under Product behavior, choose how the product should be added:
    • Recurring product — Ships with every upcoming order.
    • Next order only — Ships once with the next order, then is automatically removed from the subscription.
    • Already owned — Records a product the customer already owns, without future shipping or billing.
  4. Set the Quantity (number of units per shipment).
add_product_modal For recurring products, the Shipping date field indicates the day that the order will get created. For one-off add-ons, this field is not required since the product is included whenever the next order is generated.

To Remove a Product

Simply click on Remove next to the product. This will change the monthly amount. It will not trigger any logistics processes. To remove products from multiple subscriptions at once, use subscription product batch operations. Firmhouse uses the same removal checks as the single-subscription action.

Informing the Customer

There is no automated email that informs the customer about a change in products. Make sure to contact the customer manually and confirm the change to their subscription.