$growthServices = GrowthExperimentsServices::wrap( $services );
return new CampaignConfig(
	$growthServices->getGrowthWikiConfig()->get( 'GECampaigns' ) ?? [],
	$growthServices->getGrowthWikiConfig()->get( 'GECampaignTopics' ) ?? [],
	$services->getUserOptionsLookup()
);

urbanecm@wmf3345 GrowthExperiments % git grep GECampaigns
ServiceWiring.php:                      $growthServices->getGrowthWikiConfig()->get( 'GECampaigns' ) ?? [],
extension.json:         "GECampaigns": {
includes/Config/GrowthExperimentsMultiConfig.php:               'GECampaigns',
includes/Config/GrowthExperimentsMultiConfig.php:               'GECampaigns' => 'array_merge',
includes/Config/Validation/GrowthConfigValidation.php:                  'GECampaigns' => [
includes/NewcomerTasks/CampaignConfig.php: * Wrapper for the GECampaigns PHP / community configuration variable, used to retrieve
includes/NewcomerTasks/CampaignConfig.php:       * @return string|null The campaign name, which is the array key used in $wgGECampaigns.
tests/phpunit/unit/Config/GrowthExperimentsMultiConfigTest.php:                 'wiki only' => [ 'GECampaigns', null, [ 'foo' => 1 ], [ 'foo' => 1 ] ],
tests/phpunit/unit/Config/GrowthExperimentsMultiConfigTest.php:                 'global only' => [ 'GECampaigns', [ 'foo' => 1 ], null, [ 'foo' => 1 ] ],
tests/phpunit/unit/Config/GrowthExperimentsMultiConfigTest.php:                 'aray_merge' => [ 'GECampaigns', [ 'foo' => 1, 'bar' => 2 ], [ 'foo' => 2, 'baz' => 3 ],
urbanecm@wmf3345 GrowthExperiments % git grep GECampaignTopics
ServiceWiring.php:                      $growthServices->getGrowthWikiConfig()->get( 'GECampaignTopics' ) ?? [],
extension.json:                 "description": "A map of campaign ID to campaign configuration. Campaign configuration currently includes these fields:\n* pattern: a regexp matched against the \"campaign\" request parameter during signup to determine whether the user should be included in some campaign\n* signupPageTemplate: a template name to use for the \"benefits\" block of Special:CreateAccount\n* signupPageTemplateParameters: a map of parameters to pass to the template\n* topics: an array of topic IDs (which are defined in GECampaignTopics) to include on the top of the topic selector as custom topics\n\nExamples can be found at https://www.mediawiki.org/wiki/Extension:GrowthExperiments/Technical_documentation/Special:EditGrowthConfig.",
extension.json:         "GECampaignTopics": {
includes/Config/GrowthExperimentsMultiConfig.php:               'GECampaignTopics',
includes/Config/Validation/GrowthConfigValidation.php:                  'GECampaignTopics' => [
urbanecm@wmf3345 GrowthExperiments %