Starwood and American Express credit card has launched a promotion called “Unlock Starpoints“. You can earn 500 bonus Starpoints per stay (up to 3 stays) and book with SPG app. You must pay by American Express and register to this promotion to entitle to this offer.
Booking and Travel Period: Before March 31, 2015
You can click the link below to register of this promotion:
https://spgpromos.com/appamexbonus/
After you successful register, you will see below screenshot. 
My Conclusion
With this promotion you can earn max 1,500 Starpoints that worth USD47.25 (USD15.75 for 500 Starpoints). Thanks to Starwood !
If you want to know more about how to maximize your credit card rewards, you can check all my post here –> Maximize your credit card rewards
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