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Armory hooks are lifecycle callbacks that run during payment execution. Hooks are not x402 protocol fields. They are local runtime behavior for selection, mutation, logging, and error handling.

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Lifecycle

  1. onPaymentRequired
  2. selectRequirement
  3. beforeSignPayment
  4. afterPaymentResponse
  5. onError

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Execution Model

  • Hooks execute in array order
  • Selection narrows progressively as hooks run
  • Hook failures are fail-closed by default

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