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69 API application programming interface APP application AVI automatic vehicle location CTA Chicago Transit Authority CUTA Canada Urban Transit Association DART Dallas Area Rapid Transit DCTA Denton County Transportation Authority iOS Appleâs mobile operating system MaaS mobility as a service NFC near field communication NTD National Transit Database PCI payment card industry PKI public key infrastructure QR Quick Response Code RFI request for information RFP request for proposal RTD Regional Transportation District SaaS software as a service SDK software development kit SMS short message service (also known as a text message) TAP Transit Access Pass URI uniform resource identifier URL uniform resource locator List of Acronyms