Your coupon will be mailed to you in the post, this is not an online code to be emailed.  The coupon says the following-

Just for Mom

$15 off a purchase of $50 or more

treat yourself to something new at Gap or GapBody

(or babyGap or GapKids - I used these for my kids)

Expires July 31, 2008

offer valid thru 7/31/08 at Gap, GapBody, GapKids, babyGap stores in US only.  Qualifying amount applies to merchandise only.  Does not apply to Gift card purchases or taxes.  Limit one coupon per person per  transaction.  Coupon good for one time use only and must be redeemed at time of purchase.  Offer cannot be combined with other offers or coupons.  No adjustments on prior purchases.  Gap (or me) is not responsible for lost or stolen coupons.  Not valid for cash.  Offer not valid at Gap.com or Gap outlets.  Gap employees are not eligible for this offer.