Can anyone tell me how to get TOEFL license?

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I work in an English Center in my hometown. It's just a small city, but the need of English in my country makes it one of the choices people take to learn English (thank God). :) We also provide a TOEFL-like test and certificate for workers or students. However, the need of TOEFL is now increasing and some competitors also offers a TOEFL-like test and provide certificate. TOEFL-like certificate only lasts for 6 months and it can't be used as a guarantee to apply to bigger Universities or Companies. One franchise course in my city has offered a TOEFL certificate with a license from one of Universities in the US. My manager thinks it's time to move forward by looking for a license too. The aim is to get the customers' trust to our English Center. He asks me to search for an info on the internet but of course I don't know where to start. So, can anybody here help me and tell me who should I send an email to gain information to, or how can I get the license and from which University? Please help me...and thank you soooooooo much in advance!