Test mode

Create a Test key (it starts with smt_). Everything works the same, but nothing is sent: a simulator moves each message through the normal states within a second or two and fires the same webhooks, with "test": true.

• POST /v1/otp with a test key returns the code as test_code, so automated tests can verify it.
• Test messages do not count toward quotas or usage. Cap: 2000 per project per day.
• The Mauritius-only rule still applies, so your validation behaves like production.

Use test keys in development, CI and with AI coding agents. Switch to a live key (smk_) for production.