Okla. Stat. tit. 14A, § 14A-2-412: Notice of assignment

The buyer or lessee is authorized to pay the original seller or

lessor until the buyer or lessee receives notification of assignment

of the rights to payment pursuant to a consumer credit sale or

consumer lease and that payment is to be made to the assignee. A

notification which does not reasonably identify the rights assigned

is ineffective. If requested by the buyer or lessee, the assignee

must seasonably furnish reasonable proof that the assignment has

been made and unless he does so the buyer or lessee may pay the

seller or lessor.