Add an option to limit the coupon generation to the first time the invitee makes a purchase

Hi, I need first option (only first time) now. When I complete site, I'll post solution.
While I not found this module I thought make it with userpoints, userpoints_ubercart and referral modules:
At admin/settings/userpoints go to tab "Points for referral", set moderation to "Yes".
When invitee user paid per purchase first time set it moderated, otherwise delete (need some code for this)
In next tab like "discount settings" (I use localized drupal) set 1 point per $ and up to 100% of purchase.
I think, points are easier than coupons for users.

Hi,
I create patch which limits the coupon generation to the first time the invitee makes a purchase without option in interface. This patch also included Patch for the "no email sent" problem (http://drupal.org/node/790434).

Everybody can use and modify for free.
However you can donate using wmtransfer.com (purse Z904944383299) or yandex.ru (purse 41001240095596).

That patch seems to break the order process, When i apply the patch and try to make an order for the first time it gives me an error message after sending order, the mail gets sent but the order fails. No error is logged into watchdog. If I try again it goes trough without a problem but as if I was making second order.. so no mail or anything.

sorry, there is one thing. Please go to /admin/store/settings/invite_discount and set "Coupon Name Pattern" to "[invitor-username]-[invitee-username]". Added code search already generated coupons by this pattern and if it already exists break coupon generation. Or you can change pattern to search in line 406 (
$count = db_fetch_object(db_query("SELECT count(1) AS cnt FROM uc_coupons WHERE name = '%s-%s'", $invitor->name, $order_user->name));
) appropriate to your "Coupon Name Pattern". If these patterns aren't equal, coupons will be generated each time when invitee have complete order.
But any way patch can't break order! How your had applied it? Please review patch code and make changes manually in /sites/all/modules/uc_invite_discount/uc_invite_discount.module.

Here is a my version which:
- adds a check box in settings whether to apply to first order only
- stops duplicate coupons from being generated for the same order
- uses any name and code pattern setting
- works with table prefixes

Also includes the created date in coupon generation as per this issue: http://drupal.org/node/1178546

uc_discount is an unrelated module. This module is uc_invite_discount which ties together the invite module with the coupon module (uc_coupon). I'd suggest disabling any other discount type modules if you don't use them.

If there's a bug with that then it should probably be a separate issue.

I don't see how that would happen though, all it does is create a new coupon that only the invitor can redeem with whatever settings you specify. If its for 20% off then it would apply to the order where the invitor types the code in (presumably his next one), not to either of the original purchases.

Thanks guys! Your patches alongside this fantastic module have added an invaluable tool to my site.

For those who - like me - aren't too php savvy. Here's the module file that I ended up with after a morning of patching and tweeking.

I hope this helps someone!