How does the promo code work? iFax Support December 28, 2017 10:45 Follow 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 an auto-renewal subscription? Do I need an incoming fax number subscription to send faxes? How do I login or register for an iFax account? How do I make sure that my fax is delivered successfully? How can I receive faxes? Comments 0 comments Please sign in to leave a comment.