Using Postman to Create Gift Cards in Bulk

Hello,

I have a private app set up with the correct permissions (write gift card and read gift card), I am on shopify plus, and i have postman working.

Can someone help me with what the body of the postman POST needs to be?

Also - what is the best way to create the JSON to bulk create the GCs? Can i load it from a google doc somehow?

I am just a beginner so any help is greatly appreciated.