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)
Examples + Meaning:
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.