[Issue] Meta Checkout URL Implementation

[m2-assistant]

This issue is automatically created based on existing pull request: #39667: Meta Checkout URL Implementation

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Meta Checkout URL Implementation

This PR adds support for Meta's checkout URL specification, allowing direct linking to the checkout page with pre-populated cart items and coupon codes.

What's Changed

• Added AddToCartLinkV1 controller that processes URL parameters to populate the cart
• Added layout XML file to render the checkout page with consistent user experience
• Implemented support for multiple products and coupon codes via URL parameters

How It Works

The controller accepts URL parameters in this format:
/checkout/cart/addtocartlinkv1?products=123:2,456:1&coupon=SAVE10

This will:

1. Clear the existing cart (per Meta requirements)
2. Add 2 units of product Performance problem & memory leak in Mage_Index_Model_Process #123 and 1 unit of product Bogus error message if mcrypt extension is not installed. #456
3. Apply the "SAVE10" coupon code
4. Display the checkout page

The implementation handles error cases gracefully, showing appropriate messages for invalid products or coupons.

[m2-assistant]

Hi @engcom-Bravo. Thank you for working on this issue.
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[engcom-Bravo]

Hi @sol-loup,

Thanks for your reporting and collaboration.

To proceed further marking this as feature request.

Thanks.

[engcom-Bravo]

Confirming the issue

[github-jira-sync-bot]

✅ Jira issue https://jira.corp.adobe.com/browse/AC-14358 is successfully created for this GitHub issue.