Okla. Stat. tit. 47, § 1021

A. Transportation network companies shall implement a policy requiring TNC drivers to exclusively accept rides booked through a TNC's digital network or software application service and prohibiting solicitation of street hails or acceptance of unsolicited street hails. B. TNCs shall implement a policy prohibiting solicitation or acceptance of cash payments from passengers. A TNC may accept payment for prearranged rides made electronically using the TNC's digital network or software application or by check mailed to the TNC at an address provided by the TNC.