Because testing in production is like skydiving without a parachute API environments are separate spaces where you can safely develop, test, and experiment without breaking anything important. Think of them as practice zones: simulator for play, non-production for dress rehearsal, and production for the real show. Using environments keeps your code organized and your users happy.EnvironmentHost URLDescriptionProductionhttps://partner-api.key.comThe live environment where real financial transactions occur using actual customer data. All integrations here impact real accounts and funds.Non-Production (QV)https://partner-api-qv.key.comA staging environment for testing and validating integrations before going live. It uses test or provided data and closely mirrors production.Simulatorhttps://partner-api.key.comA mock environment with sample data to explore API behaviors and edge cases safely, without connecting to real systems. API availability by environmentAPIProductionNon-ProductionSimulatorAccount ValidationAvailableNot availableAvailableACH InquiryAvailableNot availableAvailableACH OriginationAvailableNot availableAvailableCommercial Account InformationAvailableNot availableAvailableCommercial Check ServicesAvailableNot availableAvailableIntradayAvailableAvailableNot availablePrevious DayAvailableAvailableNot availableRTP InquiryAvailableNot availableAvailableRTP Send PaymentAvailableAvailableNot availableWebhooks (ACH, Wire, and RTP)AvailableAvailableNot availableWire InquiryAvailableNot availableAvailableWire TransferAvailableAvailableNot available