Ruby fetch IDs EasyPost

gistfile1.rb

require "easypost"
EasyPost.api_key = 'YOUR API KEY'

shipment_ids = #fetch a list of shipment ids from your end

shipment_ids.each do |id|
  shipment = EasyPost::Shipment.retrieve(id)
  if shipment.tracker.status == 'pre_transit'
    begin
      shipment.refund
    rescue
      puts 'Shipment refund failed'
    end
  end
end