Checkout create error

Retired Boards Appdev Custom Storefronts

AI-generated summary

Main issue: A sales channel app creating checkouts via the GraphQL checkoutCreate mutation intermittently returned checkoutUserErrors with code INVALID for input.lineItems[0].variantId (“Variant is invalid”). Checkout via the Shopify online store succeeded for the same product.

Key context: The product variant exists and “Continue selling when out of stock” is enabled, but that setting does not affect channel availability. In Shopify, variants must be published/made available to the specific sales channel (e.g., custom storefront) to be used in checkoutCreate.

Cause identified: The variant was not available on the sales channel because another app removed the product’s sales channel assignments.

Resolution: Re-publishing/adding the product/variant back to the relevant sales channel fixed the error.

Next steps (if issue recurs):

  • Verify variant availability on the target sales channel in the Shopify admin.
  • If the error persists despite correct publishing, capture and share the X-Request-ID from the response headers for deeper investigation.

Status: Resolved; no outstanding questions.

1

Hi!
I have sales channel app, which has feature or creating checkouts.

We doing this via GraphQL mutation and it’s ok :

mutation {
      checkoutCreate(input: {
        lineItems: [{variantId: "BASE64_VARIANT_ID", quantity: 1},]
      }) {
        checkout {
           id
           webUrl
        }
        checkoutUserErrors {
          code
          field
          message
        }
      }
    }

But it seems that sometimes it working strange - on some shops we receive error

[{'code': 'INVALID', 'field': ['input', 'lineItems', '0', 'variantId'], 'message': 'Variant is invalid'}]

And it’s okay, but when I try to put this items in the cart and make checkout via shopify website - everything is going good.

The product has “Continue selling when out of stock” enabled, and variant is exists in the dashboard.
What can cause this problem ?

2

Hey Bajun - thanks for getting in touch. The most common reason this can happen is if the variant isn’t published/made available on your sales channel. If the issue still persists after you can confirm the variant is available on the sales channel, just repost here with an X-Request-ID from the response header of one of the “variant is invalid” responses you receive from Shopify and we’d be happy to look further into this with you.

Hope this helps!

3

Hi Alan!

Yeah, that was the reason - another app wiped all sales channels from the product and we missed it.

Thank you for your help!