CodeHTTPDescriptionSolution
E001400Invalid request bodyCheck required fields
E002401Invalid API keyVerify your API key
E003402Payment declinedTry another provider
E004403Insufficient permissionsCheck API key scope
E005404Resource not foundVerify the ID
E006409Duplicate idempotency keyUse a unique key
E007429Rate limit exceeded (100/min)Implement backoff
E008500Internal server errorContact support
E009502Provider unavailableAuto-retry in progress
E010503Service maintenanceCheck status.zyrix.co