Add Contacts to a Direct Select Segment By External idAsk AIput https://api.actonsoftware.com/ucl/v2/{accountId}/segment/{segmentId}/externalId/contactsPath ParamsaccountIdstringrequiredThe Act-On account Id for this requestsegmentIdstringrequiredThe Act-On segment Id for this requestBody ParamsOBJECTarrayOBJECTHeadersacceptstringenumDefaults to application/jsonGenerated from available response content typesapplication/jsontext/plainAllowed:application/jsontext/plainResponses 200200 400400 415415 500500Updated 10 months ago