1
Stephen Langhans, Laurence M Goodman, Sigman L Shapiro: Automated purchasing control system. Visa International, Townsend and Townsend and Crew, April 15, 1997: US05621201 (482 worldwide citation)

An automated purchasing control system which can be customized for a corporate customer. The system receives an authorization request over the phone lines from a remote point-of-sale terminal and processes the request using unique software. The software has a database customized to a corporate user ...


2
Stephen Langhans, Laurence M Goodman, Sigman Shapiro: Automated purchasing control system. Visa International, Townsend and Townsend and Crew, March 19, 1996: US05500513 (310 worldwide citation)

An automated purchasing control system which can be customized for a corporate customer. The system receives an authorization request over the phone lines from a remote point-of-sale terminal and processes the request using unique software. The software has a database customized to a corporate user ...