Since nobody has helped you... Fast pass simply refers to the items you get in the package.
It is exactly enough to rank a 4* bot from 1 to 2/20.
The ticket you get with the package simply unlocks the next purchase package, which is another fast pass.. enough resources to rank your 4* bot to 3/30.
You don't have to use the ticket.. the game should automatically offer you the next package, which costs significantly more energon.
It was a little confusing the first time I saw the offer pop up as well. As @Davien said, the mail that is sent out with the offer explains it a lot better.
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You're not gonna like the explanation. I'll let someone else field this one.
It is exactly enough to rank a 4* bot from 1 to 2/20.
The ticket you get with the package simply unlocks the next purchase package, which is another fast pass.. enough resources to rank your 4* bot to 3/30.
You don't have to use the ticket.. the game should automatically offer you the next package, which costs significantly more energon.
That's it, that's all.