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KarFlows gives your application one messaging layer for transactional SMS, WhatsApp delivery, OTP verification, channel fallback, and operational logs. Use KarFlows to:
  • Send directly through one channel or route across several.
  • Fall back from WhatsApp to SMS when an earlier channel is unavailable.
  • Generate and verify OTP codes entirely on the server.
  • Track acceptance, delivery reports, failures, and balance usage.

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Products

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Base URL

All requests use HTTPS and return JSON.
Start with the Unified Messaging quickstart for new integrations.

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One Stable Integration

KarFlows selects and operates the delivery connection behind each approved sender. Customer APIs expose a stable KarFlows contract, not upstream credentials or provider configuration.

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Delivery Semantics

An accepted message is not the same as a delivered message:
  1. KarFlows validates the token, plan, sender, route, and balance.
  2. The selected channel accepts or rejects the submission.
  3. An accepted request returns a message ID and enters pending or sent.
  4. A later delivery report can move SMS to delivered or failed.
Do not resend an accepted request merely because final delivery is still pending.