PROCESSING FEE FOR RETURNED CHECK.
Tex. FIN Code § 345.106.
in effectA retail charge agreement may provide that the holder of the agreement may:
(1) charge the retail buyer, on return of a dishonored check given in payment under the agreement, a reasonable processing fee that does not exceed the amount prescribed by Section 3.506 , Business & Commerce Code; and
(2) add the fee to the unpaid balance under the agreement.