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A documented HTTP API, signed webhooks, an idempotency key on every submission, and a sandbox whose documents never count as filed.
A retried submission with the same key cannot file the same document twice.
HMAC-SHA256, five retries over 24 hours, delivery state visible in the log.
Every call in the submission log with result, latency and attempt number.
Test keys are visually distinct in the console and excluded from cleared totals.