Running one call repeatedly in a collection runner

My question:

I would like to run one POST call an X amount of times repeatedly in a collection runner. Seems like I need to set a counter in pre-request script and then increment it until a specific amount before stopping.

Details (like screenshots):

I’ve already tried:

Pre request collection variable set to zero and the. Increment each time testing the value in the test to rerun the same request. The current_invoice_counter doesn’t seem to increment.