Okla. Stat. tit. 16, § 16-11A: Constructive mortgage - Exemptions

All contracts for deed for purchase and sale of real property

made for the purpose or with the intention of receiving the payment

of money and made for the purpose of establishing an immediate and

continuing right of possession of the described real property,

whether such instruments be from the debtor to the creditor or from

the debtor to some third person in trust for the creditor, shall to

that extent be deemed and held mortgages, and shall be subject to

the same rules of foreclosure and to the same regulations,

restraints and forms as are prescribed in relation to mortgages. No

foreclosure shall be initiated, nor shall the court allow such

proceedings, unless the documents have been filed of record in the

county clerk's office, and mortgage tax paid thereon, in the amount

required for regular mortgage transactions. Provided, however,

mutual help and occupancy agreements executed by an Indian housing

authority created pursuant to Section 1057 of Title 63 of the

Oklahoma Statutes shall not be considered to be mortgages or

contracts for deed under the provisions of this section.