Guide: How to Add Complementary Products

Checkout Blocks supports showing complementary products within automatic recommendations and as line item upsells. For example, show a different flavor chocolate bar as an upsell (technically a cross sell) for any given chocolate bar.

Setup instructions

  1. First populate the complementary products for any given product. You can setup complementary products across your catalog using Shopify's official Search & Discovery app.
  2. Enable "Complementary upsells" under Actions on any given Line Item Block within Checkout Blocks.

  1. You'll then see the complementary upsell button appear on eligible line items in checkout. Add "Display Rules" to the Line Item Block to limit which line items display complementary products:

Video guide

Learn more about complementary products

Bulk import recommendations

If you don't currently have complementary prioducts setup and have hundreds or thousands of products, we recommend using a 3rd party app to bulk import the configuration:

The metafield structure is as follows:

"namespace": "shopify--discovery--product_recommendation",
"key": "complementary_products",
"value": "[\"gid://shopify/Product/8705265336599\"]",
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