Looping & calc process

Hi
I am new to this platform however I have a lot of experience using SSIS


My question is this:
I am calling a webservice that returns Json

The first call gets the total number of customers
As the webservice only returns 250 records at a time I need to calculate the number of pages / calls I will need to make to get all customers

For example xx.com/customs.json?page=1 to get the 1^st 250 records then page=2 for the next 250 etc..

I can see how to use the calculate transform to get the number of pages required however
How do I do this loop?

Thanks in advance for your help !

Kevin