Prior to entry of judgment on a consumer credit transaction, the creditor may not attach unpaid earnings of the debtor by garnishment. Notwithstanding the garnishment procedure otherwise applicable after judgment, with respect to a consumer credit transaction, the amount of unpaid earnings of the debtor subject to garnishment shall not exceed the lesser of:
"Disposable earnings" means that part of the earnings of a debtor remaining after deduction of amounts required by law to be withheld, and disposable earnings shall not include periodic payments pursuant to a pension, retirement, or disability program.
Ala. Code § 5-19-15 (1975)