Counties may use credit cards that are authorized by the Oklahoma Statutes as a payment mechanism for purchases that have met the purchasing procedure requirements. There are two different credit cards that are statutorily authorized and may be used for county purchases.
19 O.S. § 1506

For the county sheriff or deputy sheriff, the Oklahoma Statutes authorize credit cards for use as payment for certain out-of-county travel expenses.
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Also, counties as political subdivisions of the state are eligible to participate in the State Purchase Card Program administered by the Office of Management and Enterprise Services (OMES). After acceptance into the program, the board of county commissioners may authorize certain employees to use a Purchase Card (P-Card) as payment for purchases for official county business. The county must adopt the State Auditor and Inspector’s (SA&I) Policy and Procedures for the P-Card program. Please reference the Purchase Card Policies and Procedures Manual (listed under "Purchase Card Resources") as adopted by the county and as required by the Office of the State Auditor and Inspector (SA&I).
74 O.S. § 85.5

This chapter will outline the roles and responsibilities, and specific procedures required for using the two different types of credit cards that are authorized for counties.