Coupon validation

[Jerome Kures]

Good morning all

I am looking for a way to validate if the customer is allowed to use a coupon before asking for payment.
In my case, I use coupons which can be redeemed only once when attached to a customer: when I compute the amount for the cart, I need to be sure that the customer has not already used the coupon.

Is there a way to check if the coupon can still be used using Stripe API?

Many thanks for your tips.

Have a great day

JK

[Zach Wick]

Hi there,

In order to determine if a particular `Coupon` is already attached to a particular `Customer` object, you should inspect the `discounts` property on the `Customer` object (https://stripe.com/docs/api/python#customer_object-discount). This property will have a null value if there are currently no `Discount` objects associated with that particular `Customer` object. If there is a `Discount` object associated with this particular `Customer` object, then the `discount` property will contain the associated `Coupon` object (as the value of the `coupon` property), and the timestamp of when this particular `Coupon` was associated with this particular `Customer` as the value for the `start` property.

A `Customer` can only have a single associated `Coupon` at a given time, so inspecting this property on the `Customer` object will be sufficient to determine if the `Customer` has already been associated with this `Coupon`.

If you want a clean mapping of `Customer` objects to `Coupon` objects, you should maintain this mapping in your own system. There is not an easy way via the Stripe API to retrieve all of the uses of a particular `Coupon`. Maintaining such a mapping in your own system would also allow you to easily create a single unique `Coupon` per `Customer`.

If you have specific questions about implementing this, I would suggest that you write in to sup...@stripe.com instead of this list.

Good luck and happy hacking!

-zach

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[Jim Danz]

Hi Jerome,

Yes, you'll want to retrieve the coupon from the API (GET
/v1/coupons/:code -- https://stripe.com/docs/api#retrieve_coupon) and
look at the `valid` property:

https://stripe.com/docs/api#coupon_object-valid
The valid property takes into account redemptions and determines
whether or not the coupon can still be applied to a customer.

Best,
Jim

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