Change #1169237 had a related patch set uploaded (by Mhorsey; author: Mhorsey):

[mediawiki/extensions/CampaignEvents@master] Update API endpoints to accept country code instead of country

https://gerrit.wikimedia.org/r/1169237

Change #1168205 had a related patch set uploaded (by Mhorsey; author: Mhorsey):

[mediawiki/extensions/CampaignEvents@master] Modifications to UpdateCountriesScript

https://gerrit.wikimedia.org/r/1168205

Change #1169237 merged by jenkins-bot:

[mediawiki/extensions/CampaignEvents@master] Update API endpoints to accept country code instead of country

https://gerrit.wikimedia.org/r/1169237

Nothing left to review here, assuming this is done. I've updated the documentation.

AC:
✅ The API to enable event registration must handle the new country code parameter
QA Note: nothing to show here, but API accepts new country code parameter, "meeting_country_code": "AW", for example.

And also displays error if country code is not present:

{
    "errorKey": "rawmessage",
    "messageTranslations": {
        "en": "The country code is required."
    },
    "httpCode": 400,
    "httpReason": "Bad Request"
}

✅ The API to edit event registration must handle the new country code parameter
QA Note: nothing to show here, but API accepts new country code parameter, "meeting_country_code": "AW", for example.

✅ The API to get event details must handle the new country code

{
    "id": 953,
    "name": "CountryDropdown",
    "event_page": "Event:CountryDropdown",
    "event_page_wiki": "my_wiki",
    "status": "open",
    "timezone": "+00:00",
    "start_time": "20250806154600",
    "end_time": "20300830154600",
    "types": [
        "media-upload-event"
    ],
    "wikis": [],
    "topics": [],
    "tracking_tools": [],
    "online_meeting": true,
    "inperson_meeting": true,
    "meeting_url": null,
    "meeting_country": null,
    "meeting_country_code": "AW",
    "meeting_address": "",
    "chat_url": null,
    "is_test_event": false,
    "questions": []
}

All AC is met here and error states are being handled in the API. Sending this to product sign off.