How Do I Determine Adword Coupon Expiration?

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Hi all -

I received an adwords coupon in exchange for some logo work.
I've never used Adwords before.

I'm considering offering the coupon in trade for some other
service, so need to determine the coupons' expiration date before doing so.

How?

Thanks in advance.

 

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I only received a numbers to use - no other information. Anyone know how to find out the expiration without actually using the coupon. I'm not contacting the guy who sent it to me.

Anyone?