[KokkieH]

Follow-up to #1992.

• get_sponsor_post_types() named central's sponsor post type as mes_sponsor; it is mes.
• wp wc-sponsor-agreements scan/backfill now also find a PDF attached to a sponsor that the sponsor's meta doesn't name, matching what the upload hook does for new files.
• Tests cover both.

Testing

Run from the repo root, with WP="docker compose exec -T wordcamp.test wp".

1. vendor/bin/phpunit --testsuite "WordCamp MU Plugins" --group sponsor-agreements passes.
2. On an event site, create a sponsor and attach a PDF to it without recording it as the agreement:

   $WP --url=https://seattle.wordcamp.test/2023 post create --post_type=wcb_sponsor --post_status=publish --post_title=Acme --porcelain
   $WP --url=https://seattle.wordcamp.test/2023 media import tmp/agreement.pdf --post_id=<sponsor> --porcelain
   $WP --url=https://seattle.wordcamp.test/2023 post get <attachment> --fields=post_status,post_parent
   

   If the status isn't inherit, reset it: post update <attachment> --post_status=inherit and post meta delete <attachment> _wcorg_sponsor_agreement.
3. $WP wc-sponsor-agreements scan --verbose lists the site. $WP --url=... wc-sponsor-agreements backfill reports the attachment as Private: yes, and post get <attachment> --field=post_status is now private.
4. On central, create a sponsor and record an agreement on it:

   $WP --url=https://central.wordcamp.test post create --post_type=mes --post_status=publish --post_title=Acme --porcelain
   $WP --url=https://central.wordcamp.test media import tmp/agreement.pdf --post_id=<sponsor> --porcelain
   $WP --url=https://central.wordcamp.test post meta add <sponsor> mes_sponsor_agreement <attachment>
   

   post get <attachment> --field=post_status is private. On production it stays inherit.

[bor0]

Checked this out locally and ran through it. The post type rename is right: MES_Sponsor::POST_TYPE_SLUG is mes, and mes_sponsor only ever existed as a $GLOBALS key. Confirmed the before/after on central.wordcamp.test and on seattle.wordcamp.test/2023 following your testing steps, and both behave as described.

Also traced the array_merge( $meta_keys, $post_types, $post_types ) placeholders and it lines up, six for six in textual order.

Updated for c8486349e — all three suggestions taken, re-ran everything, LGTM.

--group sponsor-agreements is green at 48 tests (was 47, the extra is the new data-provider row). The full WordCamp MU Plugins suite has one failure in Test_QuickBooks_OAuth_State, but it fails the same way on production with this branch stashed, so it's not from here. phpcs is clean.

To check the new row pins what it's for, I reverted get_sponsor_post_types() to 'mes_sponsor' on this head and re-ran: three failures, one per central path — the unrecorded-PDF case, the meta-key case, and the runtime hook. Before the new row, the unrecorded path was only exercised against wcb_sponsor, so it does close a real cell.

One correction to what I said earlier: I called capability_type "the one attribute of the real type the fixture doesn't have that any of this reads". It is read, via is_sponsor_upload(), but no test currently routes an upload through a mes parent — test_the_upload_hooks_decline_other_requests hardcodes the wcb_sponsor ternary — so the fixture change is fidelity for a future test rather than coverage today. Still worth having. Dropping rest_base is safe: nothing dispatches /wp/v2/mes, and the real type sets none anyway.

Non-blocking follow-up if you ever want it: parameterising the 'cannot edit the sponsor' row of data_requests_the_upload_hooks_decline by parent type would exercise central's gate too. Though with the editor/author roles the suite uses, edit_others_pages and edit_others_posts coincide, so it'd pin the mapping rather than catch anything. Genuinely take it or leave it.

Unrelated, noticed while confirming the slug: multi-event-sponsors/bootstrap.php:21-22 assigns $GLOBALS['mes_sponsor'] twice, so MES_Region() is overwritten by MES_Sponsor() on the next line. Nothing seems to read it, but it's probably where the wrong slug came from originally — might be worth a separate one-liner.

[bor0]

Approving on c8486349e. Details are in my comment above: both fixes verified locally, the mutation check confirms the new data-provider row pins the central paths, and CI is green.

Nothing blocking. The one follow-up I mentioned is genuinely optional and I would not hold this for it.