[Web] Remove redundant event detail properties

[josemiguel-alvarez]

tl;dr

• Removed top-level order, lineItems, totals, and messages aliases from Web checkout event details.
• Kept those values available through each event’s canonical checkout snapshot.
• Updated payload tests to require exact detail shapes and verify nested access.

Why

The aliases duplicated protocol-backed checkout fields and created two apparent sources of truth. A single checkout payload keeps the public event API smaller and prevents aliases from drifting from the decoded protocol model.

[github-actions]

Web — Coverage Report

Lines	Statements	Branches	Functions
	99.57% (236/237)	86.4% (108/125)	100% (63/63)

[github-actions]

Package Size

Platform	Artifact	Base	Head	Delta
Web	npm tarball	63.3 KiB	63.0 KiB	-298 B

Web file breakdown

File	Base	Head	Delta
dist/index.js.map	178.8 KiB	178.1 KiB	-704 B
dist/index.d.ts	41.5 KiB	41.2 KiB	-304 B
dist/custom-elements.json	35.5 KiB	35.5 KiB	0 B
dist/index.js	28.4 KiB	28.2 KiB	-130 B
README.md	17.3 KiB	17.3 KiB	0 B
package.json	2.8 KiB	2.8 KiB	0 B
LICENSE	1.1 KiB	1.1 KiB	0 B

Measured from the PR base SHA and PR head SHA. The file breakdown shows uncompressed sizes within each package artifact, so individual files do not sum to the compressed artifact total. This comment reports package artifact sizes only; it is not a final app binary-size report.

[markmur]

Do we need to update the readme?

[josemiguel-alvarez]

Do we need to update the readme?

Do you mean to add a migration note? Only web alpha consumers would be affected right? I think we should just add a note in the release of the next version.

[markmur]

This is the part I was thinking of https://github.com/Shopify/checkout-kit/blob/main/platforms/web/README.md#checkout-lifecycle

[josemiguel-alvarez]

This is the part I was thinking of https://github.com/Shopify/checkout-kit/blob/main/platforms/web/README.md#checkout-lifecycle

​Good catch! I'll update it right now.

[josemiguel-alvarez]

• [Web] Document canonical checkout event payloads #435
• [Web] Remove redundant event detail properties #431 👈 (View in Graphite)
• main

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[josemiguel-alvarez]

Merge activity

• Jul 10, 5:25 PM UTC: A user started a stack merge that includes this pull request via Graphite.
• Jul 10, 5:25 PM UTC: @josemiguel-alvarez merged this pull request with Graphite.