Okla. Stat. tit. 68, § 68-1354.19: Simplified Sales and Use Tax Administration Act -

Effect of Agreements on laws of state.

No provision of the Agreement authorized by this act in whole or

part invalidates or amends any provision of the law of this state.

Adoption of the Agreement by this state does not amend or modify any

law of this state. Implementation of any condition of the Agreement

in this state, whether adopted before, at, or after membership of

this state in the Agreement, must be by the action of this state.