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Errors.
Predictable.

Predictable status codes and machine-readable error types — every failure tells you what to do next.

Status	Type	Meaning
400	`invalid_request`	Malformed or missing parameters
401	`auth_error`	Invalid or missing API key
402	`charge_declined`	Instrument declined the charge
429	`rate_limited`	Too many requests — back off
500	`api_error`	Transient server error — retry

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