LinkedIn: upload companies into a company_list audience (ABM)

company_list is accepted by POST /v1/ads/audiences and returned by the list endpoint, but there is no way to put companies into one. The only member endpoint, POST /v1/ads/audiences/{audienceId}/users, takes email and phone, and

returns 422 for any audience that is not a customer_list. So a company-list audience can be created and then never filled.

Account-based marketing on LinkedIn is one of the most common B2B asks we get: a customer has a list of target companies and wants to advertise to exactly those. Today we can read and target such a list only if the customer uploads it

by hand in Campaign Manager first, which breaks the flow at the one point where our product would add value.

Request: a member upload for company_list audiences accepting company name and/or website domain, matching LinkedIn's own company-list matched audience format. Ideally the same additive-versus-replace semantics discussion as our

keyword request — LinkedIn's contact-list uploads being full-replace is a sharp edge for any tool that syncs a growing list.