How does the promo code work? Bruce December 28, 2017 10:45 You can use promo code to share with your friend and you will receive 8 credits after any transaction by your friend. You can use these credits to send a fax. - iFax Related articles How do I cancel my subscription? How many credits do I need to send a fax? How do I send a fax? How do I make sure that my fax is delivered successfully? Will my credits expire? Comments 0 comments Please sign in to leave a comment.