Pin the Apple Pay merchant identifier per sample app

[kieran-osgood-shopify]

Why

Apple Pay requires a merchant identifier, our samples got that value from multiple locations (react native had both a dynamic runtime value and a static value in the entitlements, leading to confusion)
Swift used a dynamic value, but used a name that sounds like storefront configuration

What

Updated all samples to use APPLE_PAY_MERCHANT_IDENTIFIER from the .env
Propagate the value to entitlements via xcconfig and xcodegen
Going forwards updating this value is a single line update for each app respectively

How

One part that was tricky was the react-native one as we dont use xcodegen the ios files are committed, which means xcode expects a file reference to the xcconfig in the pbxproject, but we generate the xcconfig from .env

To workaround this I used an empty Config.xcconfig committed, and inside of it use an include directive to pull in an optional Storefront.xcconfig

This gives us the benefit of compilation working from a clean clone for CI and matching the react-native/swift DX

Additional

To avoid breaking peoples dev up on the next pull, the existing STOREFRONT_MERCHANT_IDENTIFIER .env value will be temporarily mapped to the new values

(it'll become moot once the PR's above merge to generate the .env)

---

Before you merge

Important

• I've added tests to support my implementation
• I have read and agree with the Contribution Guidelines
• I have read and agree with the Code of Conduct
• I've updated the relevant platform README (platforms/swift/README.md and/or platforms/android/README.md)

---

Releasing a new Swift version?

• I have bumped the version in ShopifyCheckoutKit.podspec
• I have bumped the version in platforms/swift/Sources/ShopifyCheckoutKit/ShopifyCheckoutKit.swift
• I have updated the SwiftPM/CocoaPods version snippets in platforms/swift/README.md (major version only)

Releasing a new Embedded Checkout Protocol version?

• I have bumped embeddedCheckoutProtocolAndroid in platforms/android/gradle/libs.versions.toml
• I have updated protocol/languages/kotlin/embedded-checkout-protocol/api/embedded-checkout-protocol.api if the public API changed

Releasing a new Android version?

• I have bumped checkoutKitAndroid in platforms/android/gradle/libs.versions.toml
• I have updated the Gradle/Maven version snippets in platforms/android/README.md

Tip

See the Contributing documentation for the full release process per platform.

[kieran-osgood-shopify]

• Build E2E apps from e2e/.env, not the demo store #583
• Isolate E2E configuration and decrypt it in Bitrise #582
• Read E2E credentials from e2e/.env instead of the root .env #581
• Generate env files from EJSON with local overrides #580
• Introduce .env.local as override layer on .env #579
• Pin the Apple Pay merchant identifier per sample app #578 👈 (View in Graphite)
• Store storefront config in encrypted ejson files #577
• main

This stack of pull requests is managed by Graphite. Learn more about stacking.

[github-actions]

Package Size

Platform	Artifact	Base	Head	Delta
React Native	npm tarball	101.6 KiB	101.6 KiB	0 B

React Native file breakdown

File	Base	Head	Delta
node_modules/@shopify/checkout-kit-protocol/src/generated/Models.ts	85.4 KiB	85.4 KiB	0 B
node_modules/@shopify/checkout-kit-protocol/src/generated/Models.d.ts	53.0 KiB	53.0 KiB	0 B
ios/AcceleratedCheckoutButtons.swift	14.1 KiB	14.1 KiB	0 B
ios/ShopifyCheckoutKit.swift	13.5 KiB	13.5 KiB	0 B
src/components/AcceleratedCheckoutButtons.tsx	13.0 KiB	13.0 KiB	0 B
android/src/main/java/com/shopify/reactnative/checkoutkit/ShopifyCheckoutKitModule.java	12.8 KiB	12.8 KiB	0 B
lib/commonjs/index.js	12.3 KiB	12.3 KiB	0 B
src/index.ts	12.2 KiB	12.2 KiB	0 B
lib/commonjs/components/AcceleratedCheckoutButtons.js	11.4 KiB	11.4 KiB	0 B
lib/commonjs/components/AcceleratedCheckoutButtons.js.map	10.4 KiB	10.4 KiB	0 B
lib/module/components/AcceleratedCheckoutButtons.js	10.2 KiB	10.2 KiB	0 B
lib/module/index.js	10.2 KiB	10.2 KiB	0 B
node_modules/@shopify/checkout-kit-protocol/src/generated/ProtocolNotifications.ts	9.5 KiB	9.5 KiB	0 B
src/index.d.ts	9.1 KiB	9.1 KiB	0 B
lib/module/components/AcceleratedCheckoutButtons.js.map	9.1 KiB	9.1 KiB	0 B
src/present-dispatcher.ts	8.0 KiB	8.0 KiB	0 B
lib/module/index.js.map	7.9 KiB	7.9 KiB	0 B
lib/commonjs/index.js.map	7.7 KiB	7.7 KiB	0 B
node_modules/@shopify/checkout-kit-protocol/src/generated/ProtocolNotifications.d.ts	7.6 KiB	7.6 KiB	0 B
node_modules/@shopify/checkout-kit-protocol/src/generated/ProtocolRenameMap.ts	7.2 KiB	7.2 KiB	0 B
…and 110 smaller files

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.

[github-actions]

React Native — Coverage Report

Lines	Statements	Branches	Functions
	91.64% (307/335)	88.88% (176/198)	100% (81/81)

[bitrise]

Install this build

Open Tophat, select your target device, then click Install. Links open on the Mac running Tophat.

SDK	Install
React Native	Install with Tophat
Swift	Install with Tophat

Checkout Kit E2E results

Status	Suite	Target	Platform	OS version tag	Device
✅	tests/shared/launch-smoke.yaml	react-native	ios	latest	iPhone 15 iOS 27 Beta
✅	tests/shared/launch-smoke.yaml	react-native	android	latest	Google Pixel 9 Android 17.0
✅	tests/shared/launch-smoke.yaml	swift	ios	latest	iPhone 15 iOS 27 Beta

[kieran-osgood-shopify]

Merge activity

• Aug 12, 8:19 AM UTC: A user started a stack merge that includes this pull request via Graphite.
• Aug 12, 8:21 AM UTC: Graphite rebased this pull request as part of a merge.

[kieran-osgood-shopify]

this went the wrong direction due to entitlements, updating to use xcconfig now