CitiConnect API
CitiConnect is the corporate treasury and trade integration channel within Citi's Treasury and Trade Solutions (TTS) business, exposing APIs for real-time payment initiation, payment status reporting, request-to-pay, direct debits, faster payments, and account-balance inquiry for enterprise clients connecting through ERP and TMS systems. Launched in late 2017, CitiConnect APIs span the full TTS footprint of 90-plus countries and have processed more than one billion API calls. Authentication uses OAuth 2.0 with mutual TLS. It offers complete API documentation and a functional sandbox to onboarded corporate clients; no public downloadable OpenAPI is available.