Spend $15, get $4 credit – eBook deal@Amazon- Maybe Targeted

This may be a targeted email I received from Amazon. Please check your email inbox.
How it works:
1.
Click Activate any time during the offer period. Eligible purchases made before activation still count!
2.
Spend $15 on any eBooks by Sept 5.
3.
Get $4 back in eBook credit to spend on any eBooks.
https://smile.amazon.com/kr/d6e5a…154_LEMAIL