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"""Safe, typed errors for the synthetic commerce flow.""" |
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from __future__ import annotations |
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from collections.abc import Mapping |
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class CommerceError(RuntimeError): |
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"""Base error with a stable, non-secret error code.""" |
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def __init__( |
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self, |
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code: str, |
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message: str, |
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*, |
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diagnostics: Mapping[str, object] | None = None, |
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) -> None: |
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super().__init__(message) |
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self.code = code |
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self.diagnostics = dict(diagnostics or {}) |
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class ProtocolError(CommerceError): |
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"""The merchant response did not satisfy the expected x402 shape.""" |
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class PolicyDenied(CommerceError): |
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"""Application-owned policy denied the proposed purchase.""" |
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class IdempotencyConflict(CommerceError): |
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"""An idempotency key was reused for a different purchase.""" |
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class MerchantRejectedPayment(CommerceError): |
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"""The synthetic merchant rejected the supplied payment proof.""" |
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class LivePaymentDisabled(CommerceError): |
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"""A networked live payment was attempted; Omnipay sim refuses it.""" |
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class AgentResultInvalid(CommerceError): |
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"""The agent result did not match application-observed purchase evidence.""" |