Update parsing for checkout URL product IDs

[carterbuce]

Changes proposed in this Pull Request:

Meta sends products to the checkout URL using the Retailer ID format:

facebook-for-woocommerce/includes/fbutils.php

Line 188 in 33d36f2

public static function get_fb_retailer_id( $woo_product ) {

Our checkout logic currently expects just the numeric product ID to be sent. Since we cannot update the Retailer ID format (it would cause issues for existing installations), this PR updates our checkout URL parsing logic to accept both formats.

• Do the changed files pass phpcs checks? Please remove phpcs:ignore comments in changed files and fix any issues, or delete if not practical.

Screenshots:

Detailed test instructions:

Steps, where ID is “{product_sku}_{product_id}”:

1. Test checkout permalink with one product (e.g. `/fb-checkout?products=:<#>)
2. Test checkout permalink with two product (e.g. `/fb-checkout?products=:<#>,:<#>)
3. Test checkout permalink with products and a coupon (e.g. `/fb-checkout?products=:<#>,:<#>&coupon=)

Additional details:

Add - logging for add to cart failures

Changelog entry

Updated to Checkout URL handler to parse Retailer_ID format for product IDs

[facebook-github-bot]

@carterbuce has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator.

[facebook-github-bot]

@carterbuce merged this pull request in 938be71.