Minn. Stat. § 45.26: PAYMENT OF FEES.

Subdivision 1. Manner of payment.

All fees must be paid by check, draft, or other negotiable or nonnegotiable instrument or order of withdrawal that is drawn against funds held by a financial institution. Cash will not be accepted.

Subd. 2. Refunds.

An overpayment of a course or coordinator approval fee must be refunded within 90 days after a letter requesting the refund is received by the commissioner and signed by the person making the overpayment.

Refunds must not be given for other than overpayment of fees. A request for a refund of an overpayment must be received by the commissioner within six months of the date of deposit or it will be forfeited.