Deletes a tag definition. The delete is permanent: the tag no longer appears in GET /tags and GET /tags/{id} returns 404. The tag's associations to contacts are not deleted with it: they no longer appear under GET /contacts/{id}/contactTags, but GET /contactTags still lists them (for example with filters[tagid]) and counts them in meta.total, and each one can still be fetched with GET /contactTags/{id} and removed with DELETE /contactTags/{id}. Links from templates to the tag are removed. Automations and segments that reference the tag are not changed. To take a tag off a single contact without deleting the tag, use DELETE /contacts/{id}/tags/{tagId} instead. Returns 200 with an empty object. Requires the tag management permission.
This will remove the tag from all ContactsThis call will remove the targeted tag from all Contacts that have it.
To remove a tag for an individual contact, but not delete the tag itself:
Retrieve the "association id" with a GET call to /api/3/contacts/:contactId/contactTags,
Then delete that associate between tag and contact, here: https://developers.activecampaign.com/reference/remove-a-contacts-tag