Need help in looping service


I have a requirement like- there are 4 APIs in a collection, where 3 APIs will get call once and the 4th API will be called repeatedly as it is having 9 rows of records.

1- Access Token
2- Transaction Token
3- Post/customer
4- Patch/customer(its having 9 rows of data)

I have used postman.setnextrequest(Patch/customer). But issue is that its calling 9 times but the same record again and again. Not shifting to the next record. I don’t have much knowledge on looping. Please help. Thanks in advance !!