How do i get overtime money after i get fire in arizona?

I was fired from my job a couple of months and i just remember in my last paycheck didn’t get paid for my overtime i have done while working there. I know for a fact that the employer adjust your hours if you go over 40 hours a week. is that legal?how i can i receive my overtime money? what action can i take?

What is the motor carrier law with regards to regulating overtime pay with Couriers such as FeDex or DHL?

Can the department of labor enforce overtime pay for Couriers for business that deliver and pick up packages. There is no CDL requirements for this type of job . It working for DHL( doing the same things that UPS and Fedex do). Or is there a law stating that the NCDOT has jurisdiction over this type of work and thus exempt from overtime if a salaried employee.