Bystep guide to understanding the bidding process, along with tips on submitting a successful bid. Prospective Bidders must examine the documents carefully.When a mini-bid is required, the exact process is clearly outlined in the backdrop contract. The mini-bid award is made based on best value or lowest price. Fill out and submit Substitute W-9 Form available from the New York City Comptroller. 2. Gov with the RFB's number and title in the subject line of your e-mail. Bid security may be in the form of a bid bond, certified check or other guaranteed negotiable instrument, or letter of credit.