| 1 | """Safe, typed errors for the synthetic commerce flow.""" |
| 2 | |
| 3 | from __future__ import annotations |
| 4 | |
| 5 | from collections.abc import Mapping |
| 6 | |
| 7 | |
| 8 | class CommerceError(RuntimeError): |
| 9 | """Base error with a stable, non-secret error code.""" |
| 10 | |
| 11 | def __init__( |
| 12 | self, |
| 13 | code: str, |
| 14 | message: str, |
| 15 | *, |
| 16 | diagnostics: Mapping[str, object] | None = None, |
| 17 | ) -> None: |
| 18 | super().__init__(message) |
| 19 | self.code = code |
| 20 | self.diagnostics = dict(diagnostics or {}) |
| 21 | |
| 22 | |
| 23 | class ProtocolError(CommerceError): |
| 24 | """The merchant response did not satisfy the expected x402 shape.""" |
| 25 | |
| 26 | |
| 27 | class PolicyDenied(CommerceError): |
| 28 | """Application-owned policy denied the proposed purchase.""" |
| 29 | |
| 30 | |
| 31 | class IdempotencyConflict(CommerceError): |
| 32 | """An idempotency key was reused for a different purchase.""" |
| 33 | |
| 34 | |
| 35 | class MerchantRejectedPayment(CommerceError): |
| 36 | """The synthetic merchant rejected the supplied payment proof.""" |
| 37 | |
| 38 | |
| 39 | class LivePaymentDisabled(CommerceError): |
| 40 | """A networked live payment was attempted; Omnipay sim refuses it.""" |
| 41 | |
| 42 | |
| 43 | class AgentResultInvalid(CommerceError): |
| 44 | """The agent result did not match application-observed purchase evidence.""" |