Bulk SMS Verification: Designing a Controlled API Workflow

A repeatable verification workflow should authenticate every request, isolate account ownership, and use idempotency so network retries do not create duplicate orders. It also needs explicit handling for waiting, completed, cancelled, and expired states.

Check available balance, create one order with a unique idempotency key, and poll the same order at a controlled interval until a code arrives or the order expires.

• Store API keys only on the server
• Use one idempotency key per business request
• Respect documented rate limits
• Branch on error codes rather than translated messages

NumFlow reserves the platform price when a number is allocated and completes the charge after the first verification code is received. Eligible orders without a code release the reserved amount when cancelled or expired according to the system result.