Is this good for meeting a cc spending threshold? "Cancellation will result in Delta credit equal to Groupon price; credit valid for 1 year." Does that mean after 1 year you receive a refund or if you want a refund they will give it to you anytime? (I'm a groupon noob so not sure how their refunds work...) (The $20,000 ticket would be great for the extra 50k Avios on my BA card)