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Interswitch Webhooks

Interswitch Webhooks — receive real-time event notifications for transactions, subscriptions, payment links, and invoices. Validate signatures with HmacSHA512, handle retry logic, and process all event types. Use this skill whenever setting up webhook endpoints, validating X-Interswitch-Signature headers, handling async payment confirmations, processing subscription lifecycle events, or debugging webhook delivery. Also use when you see references to X-Interswitch-Signature, HmacSHA512, webhook event types, or Quickteller Business webhook configuration.