Include att param in request

[kiftio]

What changes are you making?

Appends the App Tracking Transparency (ATT) authorization status as a _att query parameter to the checkout URL when presenting the checkout experience. This allows the checkout to be aware of the user's tracking consent status on iOS 14+.

The ATT status is mapped to one of the following string values: authorized, denied, not_determined, restricted, unknown, or not_applicable (when ATT is unavailable on the platform). If a _att query parameter already exists on the URL, it is replaced to ensure only a single value is present. The implementation conditionally imports AppTrackingTransparency so it remains compatible with environments where the framework is unavailable.

How to test

1. Run the existing test suite to verify the new CheckoutURLTests cases pass, including:
   • ATT status is appended as _att to a clean URL
   • Existing query parameters are preserved alongside _att
   • An existing _att parameter is replaced rather than duplicated
   • Appending the status multiple times is idempotent
2. Build and run the sample app on a physical device or simulator running iOS 14+. Trigger the checkout flow and inspect the URL passed to the web view to confirm the _att parameter reflects the device's current ATT authorization status.
3. Verify the build succeeds on targets where AppTrackingTransparency is not available (e.g., macOS or older iOS targets) and that not_applicable is used in those cases.

---

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

Releasing a new Android version?

• I have bumped the versionName in platforms/android/lib/build.gradle
• I have updated platforms/android/CHANGELOG.md
• 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.

[github-actions]

React Native — Coverage Report

Lines	Statements	Branches	Functions
	91.59% (316/345)	87.25% (178/204)	100% (82/82)