ðeɪ mˈʌst jˈuːz ðə ɡlˈoʊbəl bˈʊkɪŋ wˈɛbsˈaɪt, ðˌoʊ mˈɛni ˈɑːpɚɹˌeɪt ðɛɹ ˈoʊn wˈɛbsaɪts æz wˈɛl, ænd ɐ pɚsˈɛntɪdʒ ʌvðə ɹˈɛvənˌuː ɪz pˈeɪd tə sˈɪɾi sˈaɪtsiːɪŋ.
They must use the global booking web-site, though many operate their own websites as well, and a percentage of the revenue is paid to City Sightseeing.