One flag, zero risk
Test keys return the same shapes as live - segments, encoding, cost, message id - and drive the full lifecycle so your webhooks fire for real. Deterministic magic numbers let you rehearse every outcome before you go live.
- FREENo real sends, no charges - your balance is never touched.
- DLRSimulated queued → delivered, with signed webhooks (livemode:false).
- MAGICNumber ends …0000 undelivered · …0003 failed · …0009 402.
- SDKSame call in Node, Python, PHP, Go - auto-detects test keys.



