Why does it want three values to connect?
Zendesk's API token authentication identifies the instance, the agent and the token separately: the subdomain says which Zendesk, the agent email says who the calls are made as, and the token authorises them. The permissions you get are that agent's, so a token from a restricted agent sees a restricted set of tickets, which is worth checking if an import looks short.
Can it update or close tickets?
No. It imports, and it can raise new tickets, and that is deliberately the whole surface. Editing tickets from a second system is how two tools end up disagreeing about the state of a conversation a customer is still having. Zendesk stays the place support works; this is where the tickets get counted and connected.
Does it keep up with Zendesk?
It can. Importing again updates the same table, matched on Zendesk's IDs, and Keep in sync does that hourly or daily. For the questions this answers — cost to serve, volume against revenue, which accounts are heaviest — a daily sync is plenty, since those are questions about trends. Nothing here is intended to give an agent a live queue; Zendesk already does that well.
Should I use this or RowFold's own helpdesk?
If you are already committed to Zendesk and want the numbers connected to everything else, this. If you are choosing now, RowFold's own ticketing sits in the same workspace as the customer, the order and the job, with no import in between and no second place for the conversation to live. The two are genuinely different choices rather than one being a lesser version.
What about organisations that do not exist in Zendesk?
Tickets raised by a user with no organisation set come across with that field empty, which is accurate. It is also probably the commonest reason a per-account report looks short by a few percent. Zendesk's own views hide the problem because they count tickets rather than accounts, so it is worth checking once when the numbers first look odd.