The causative is used when we pay, make or delegate someone else to do something for us.
FORM = NOUN + HAVE/GET + NOUN + PAST PARTICIPLE (+ BY/WITH + NOUN/SUBJECT)
I get my hair cut by the barber on Main Street. The barber on Main Street cuts my hair.
I have my shopping delivered to my house. The shopping is delivered to my house.
I am going to have the house painted. I will pay someone to paint my house.
I had my car fixed at the garage. The mechanic fixed my car at the garage.
*Using get is more informal than have but has exactly the same meaning and is more common in spoken English.