code: public Redemption redeemCoupon(final String couponCode, final Redemption redemption) {
          return doPOST(Coupon.COUPON_RESOURCE + "/" + couponCode + Redemption.REDEEM_RESOURCE,
                        redemption, Redemption.class);
      }
docs: Redeem a {@link Coupon} on an account.
  
  @param couponCode redeemed coupon id
  @return the {@link Coupon} object