From the advanced menu, via the Adobe Campaign logo, select Administration > Development, then Publication.
Click the Prepare Publication button.
Select the Create the Profiles & Services Ext API option.
If the API has already been published (meaning if you have already checked this option once, for this resource or another resource), the API update is forced.
Click the Profiles & Services API Preview tab.
This will show you the changes that the publication of the API will apply to the current version of the profilesAndServicesExt API.
Here, the Promo Code field (ID: cusBrand) will be inserted into the API.
Click the Publish button.