Why there is no official iMessage API
The constraint
Messages is an application on Apple devices, and Apple offers no way to send or receive iMessages from a server. Anything that puts a business on iMessage is, underneath, a Mac signed into an Apple account. That is not a workaround a vendor chose; it is the only shape the platform allows, and every honest iMessage product will tell you the same.
What running it well means
A Mac has to be signed in by hand, kept awake, updated, and recovered when macOS decides otherwise. One Apple account serves one line, and a machine holds a small number of accounts before it becomes unreliable. Running that fleet is operations work, and it is the part a business should never have to see.
The control plane in front
Mapier puts a control plane between your application and the fleet. A key names one project and one environment. A send is a command, journaled with an idempotency key, so a retry is adopted rather than sent twice. A message settles on evidence from the transport, and when the outcome cannot be proved its status says so — needs_reconcile — rather than claiming delivered. STOP and UNSUBSCRIBE are recognised on every inbound message. Every administrative action lands in an audit log the API can only add to.
What that leaves you
One unified API, an event stream that resumes, signed webhooks that retry, and a sandbox to evaluate against before a real number is involved. The Macs are ours to run.
