Flat rate does not mean unlimited simultaneous work
The pricing model separates volume from capacity. You can send unlimited render volume over the month, while your plan defines how many renders may run at the same time. This lets you choose a plan around throughput rather than an unpredictable per-video total.
Build your workflow around the concurrency cap
When your available slots are occupied, treat that as a capacity signal and retry after a render completes. Do not rely on excess requests being held in an automatic queue. If your workload needs more simultaneous renders, select the plan that matches that operating requirement.
Flat-rate rendering, callback delivery
The initial API response confirms that Rendofy accepted the job. The completed MP4 arrives at the callback URL you included in the request. That makes cost and execution behavior legible in n8n, Make, and custom backends.