Amazon is offering 20% off purchases sold by Amazon, in addition to various gift cards not sold by Amazon, for those that apply at least 1 Membership Rewards point to their order and pay with the Amex card that earned it. The maximum discount is $50 on a $250 order. Note that while widely available, it does appear that this is a targeted offer.

Update 11/26/18: This looks to be a targeted offer, so not everyone who has a Membership Rewards earning Amex card added to their Amazon account as a payment method will qualify.

Amazon is offering 20% off purchases sold by Amazon, in addition to various gift cards not sold by Amazon, for those apply at least 1 Membership Rewards point to their order and pay with the Amex card that earned it. The maximum discount is $100 on a $500 order.

1. Navigate here and click the “Click to activate” button to apply the offer to your Amazon account.

2.

Right now you can get 20% off your purchase of a product (or products) sold and shipped by Amazon, up to a $100 discount, when you apply at least one Membership Reward point to payment.

This is especially pertinent as Amazon Prime Day just kicked off: 36 hours of massive sales for Amazon Prime members. Prime Day started at 12 pm PT today. Don't have a Prime membership but want to take advantage of the sales? Sign up for a free trial.

We've been seeing a lot of valuable Amex offers for Amazon purchases lately, which I'm all for as we all probably spend on Amazon anyways.

Do you have a debit or credit card issued by Citi?

More specifically, do you have a personal credit or debit card (not business), excluding the Costco and Chairman credit cards? If the answer is yes then you're eligible for Amazon and Citi's latest promotion: a four month free trial of Amazon's premium music streaming service, Amazon Music Unlimited.

New users can get a free month trial any time. Citi and Amazon's new deal is for a three month trial, but you can stack the two promotions for a total of four months.

Enroll any Membership Rewards earning card today for 2x Membership Rewards at Amazon on purchases through July 31, 2016.

Sign into your American Express account, click on the card you want to enroll, and scroll down to see your "Amex Offers & Benefits."

For my AMEX Platinum, the Amazon offer was listed second.

You can enroll through July 31, 2016 and earn one bonus point per dollar on Amazon purchases made after enrollment through July 31, 2016. Bonus points will post by October 29, 2016.

Bonus points are not available at foreign versions of Amazon.