Many stores issue coupons that are valid only in their store. Another retailer usually will not accept a store specific coupon. However, some will match a coupon if you ask the store manager.
I'm not certain what coupons 7eleven accepts but you can use any valid coupon at any store that accepts them, just give it to them when you are checking out. Normally a store will state on a sign if they will not accept certain types of coupons, like computer generated ones.
Be aware that you can't doctor any coupon to change the information on it as the bar code will show if that information is correct or not.
If you wanted to use a coupon, you should check on some basic stuff like the expiration date etc. Before you come to a store, you can call the store first if they accept your coupon to avoid frustration. Some store do accept and some don't.
Each coupon would have its own Terms & Conditions - read them.
Coupons are usually just store specific.
As I know, you can only use coupon codes when you are buying online, Every online store have coupon codes inputting.
Too many variables to answer.
I honestly have never used a coupon before, but I have seen my parents cut them out of magazines and daily newspapers.
When could you use them at a store? What I mean by that is, can I just print one out online with a valid bar code (and one that isn't expired) and bring it to *any* store that accepts them? Say for instance, I have a coupon off of Swagbucks and I wanted to use it at a 7 11. Would they accept it?