Collecting alimony that is NOT court ordered

My husband and I divorced. We agreed upon on an amount and length of time for spousal support. It was NOT court ordered, a judge simply signed the stipulation. His place of employment cannot legally take the money from his check as there is simply no court order. He is starting to be late on his payments. He still pays, but sometimes a day or two late, sometimes as much as a week or more. Do I have any legal recourse?