Number Formatter Question - Aggregate data from API dynamically

I am trying to sum order data for each customer received as a JSON object from a previous step API Call. I need this to be dynamic given each customer is different. How do I use a variable for the JSON object to add all data received? see screen grab below:

You need to turn off simple response toggle of your API action step and hen click on save & send test request again to get out in array format.

Use that in Data Transformer - Line Itemizer action.

That will vie you all the orders' totals comma separated.

Use that in your number formatter step.

You need to turn off simple response toggle of your API action step and hen click on save & send test request again to get out in array format.

Use that in Data Transformer - Line Itemizer action.

That will vie you all the orders' totals comma separated.

Use that in your number formatter step.