fix: content gate metadata methods and params

[dkoo]

All Submissions:

• Have you followed the Newspack Contributing guideline?
• Does your code follow the WordPress' coding standards and VIP Go coding standards?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?

Changes proposed in this Pull Request:

Fixes a fatal error due to referencing a method that moved from the Newspack\Memberships class to Newspack\Content_Gate. Also ensures that GA4 custom events receive the gate_post_id and newspack_popup_id params throughout auth and modal checkout flows by normalizing the param name from memberships_content_gate to gate_post_id (Automattic/newspack-blocks#2121 attempted to do this with Automattic/newspack-blocks@0c5301b#diff-f371eb641807afd155089ce67e2add277c8d7a9dfe029518e977527c7ca015c3R144-R148 but some flows still expected the memberships_content_gate param).

How to test the changes in this Pull Request:

1. On release for this repo and Newspack Blocks, complete registration, login, and modal checkout flows from a content gate and a Campaigns prompt. Observe that:

• Some GA4 events drop the gate_post_id and newspack_popup params
• Upon completing a modal checkout from within a content gate, an error occurs while processing the transaction:

2025-11-11T14:54:12+00:00 Error scheduled action 4317730 (subscription payment) failed to finish processing due to the following exception: Call to undefined method Newspack\Memberships::get_gate_metadata() in /wordpress/plugins/newspack-plugin/6.24.1/includes/data-events/class-memberships.php:211

• A potential fatal error when rendering a Countdown block:

PHP Fatal error:  Uncaught Error: Class "Newspack\Memberships\Metering" not found in /newspack-repos/newspack-plugin/src/blocks/content-gate/countdown-box/class-content-gate-countdown-box-block.php:48
Stack trace:
#0 /var/www/html/wp-includes/class-wp-block.php(586): Newspack\Content_Gate_Countdown_Box_Block::render_block()
#1 /var/www/html/wp-includes/blocks.php(2359): WP_Block->render()
#2 /var/www/html/wp-includes/blocks.php(2431): render_block()
#3 /var/www/html/wp-includes/class-wp-hook.php(324): do_blocks()
#4 /var/www/html/wp-includes/plugin.php(205): WP_Hook->apply_filters()
#5 /var/www/html/wp-includes/post-template.php(256): apply_filters()
#6 /newspack-repos/newspack-theme/newspack-theme/template-parts/content/content-single.php(45): the_content()
#7 /var/www/html/wp-includes/template.php(812): require('...')
#8 /var/www/html/wp-includes/template.php(745): load_template()
#9 /var/www/html/wp-includes/general-template.php(206): locate_template()
#10 /newspack-repos/newspack-theme/newspack-theme/single.php(44): get_template_part()
#11 /var/www/html/wp-includes/template-loader.php(106): include('...')
#12 /var/www/html/wp-blog-header.php(19): require_once('...')
#13 /var/www/html/index.php(17): require('...')
#14 {main}
  thrown in /newspack-repos/newspack-plugin/src/blocks/content-gate/countdown-box/class-content-gate-countdown-box-block.php on line 48

2. Check out this branch and fix: content gate metadata methods and params newspack-blocks#2249.
3. Follow instructions from fix(ga4): ensure gate_post_id and newspack_popup_id are passed to activities #3956 and confirm that gate_post_id and newspack_popup_id params are appended to all GA4 events from registration, login, and modal checkout flows originating from a content gate and Campaigns prompt, respectively.
4. Confirm no fatal error from completing the content gate > modal checkout transaction, and no fatal error when rendering the Countdown block

Other information:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your changes, as applicable?
• Have you successfully ran tests with your changes locally?

[miguelpeixe]

Tests well!

I left a couple of non-blocking comments; feel free to merge after addressing them.

[miguelpeixe]

Given we're already in Newspack namespace, this and the one below are superfluous.

[dkoo]

True, I didn't check this and just followed the existing pattern 😄

[miguelpeixe]

Same as the previous comment, these 3 lines are superfluous

[leogermani]

I wasn't able to confirm the GA properties.. I still didn't see them. But approving because the PHP fatal is more important

[matticbot]

🎉 This PR is included in version 6.24.2 🎉

The release is available on GitHub release

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