Missing attributes in "Cart/Create" webhook

Technical Q&A
1

I’m adding the below attribute to the cart on page load

fetch('/cart/update.js', {
  method: 'POST',
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify({ attributes: {test:"testvalue"} })
})

and I added a webhook in Settings → Notification → Webhook with carts/create and checkouts/create but the problem is the carts/create webhook doesn’t have this “test” attribute.

When I checked the /cart.js it’s there and I can see it in the incoming checkouts/create webhook data

Any ideas?

2

For api feature requests, or possible bug reports, use the developer forum https://community.shopify.dev waaaay better experience for devs right now

:scientist: Notes for future searchers a lot of posts about cart/create, carts/update ,checkouts/create etc behaviors have been lost to time and forum migrations.
Do not expect parity or consistency between shopify’s apis , especially between frontend and backend
:balance_scale::classical_building::man_judge:█▬▬
e.g. https://www.google.com/search?q=community+shopify+dev+webhook+missing __X
e.g. https://community.shopify.com/t/webhook-payloads-are-not-sufficiently-documented/406065

Attributes, ~CustomAttributes, are not listed in the docs https://shopify.dev/docs/api/webhooks/latest?reference=toml&accordionItem=webhooks-carts-create#list-of-topics-carts/create

So do not plan on it being added in any near term if ever.
In the here and now developers need to:

  • stuff the info into the cart note (flaky and harder UX, more relevant for ERP situations[1])
  • stuff the info into product line item properties
    • and or a literal product to the cart that is a special “info” item
      • (items can be nested now, and there is a removable property that may nor may not be useable somehow??)
  • :technologist: Or fire off to your own webhook from the visitors browser and reconcile the two with some broad risky/flakey assumptions about session matching especially if it’s not a logged in customer.

[1] note to self I could have sworn I had a reply on the .dev forums about these approaches but can’t find it.