Add version field to Checkout and Cart interfaces

[Copilot]

• Add version field to the Checkout interface in both core and payment-integration-api packages
• Add version field to the Cart interface in both core and payment-integration-api packages
• Update all corresponding mock data to include version: 2 matching the API response format
• Fix build errors in payment-integrations-test-utils mock data

Changes Made

• Added version: number field to the Checkout interface in both core and payment-integration-api packages
• Added version: number field to the Cart interface in both core and payment-integration-api packages
• Updated all corresponding mock data to include version: 2 matching the API response format
• Fixed missing version field in payment-integrations-test-utils cart and checkout mock data

API Response Structure

The Checkout API response includes a version field at both the checkout and cart levels:

{
  "id": "640ac03c-e3d1-453c-8884-abad6503d6a3",
  "cart": {
    "id": "640ac03c-e3d1-453c-8884-abad6503d6a3",
    "version": 2
  },
  "version": 2
}

These interface changes ensure the TypeScript definitions accurately reflect the actual API response structure, enabling proper type safety when working with checkout and cart objects that include version information.

Files Modified

• packages/core/src/checkout/checkout.ts
• packages/payment-integration-api/src/checkout/checkout.ts
• packages/core/src/cart/cart.ts
• packages/payment-integration-api/src/cart/cart.ts
• packages/core/src/checkout/checkouts.mock.ts
• packages/core/src/cart/carts.mock.ts
• packages/payment-integration-api/src/mocks/carts.mock.ts
• packages/payment-integrations-test-utils/src/test-utils/carts.mock.ts
• packages/payment-integrations-test-utils/src/test-utils/checkouts.mock.ts

The changes are minimal and maintain backward compatibility while providing complete type coverage for the API response. All tests pass and the build completes successfully.

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[Copilot]

@copilot fix this: > @***********/[email protected] build

npm run bundle && npm run bundle-dts

...

Fixed the build errors. The issue was that the version field added to Cart and Checkout interfaces was missing from the mock data in payment-integrations-test-utils. I've updated both mock files to include version: 2. Build now completes successfully with commit abe1cee.