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If you’re a Discover credit card holder and you’re getting ready for Amazon Prime Day, you might be in luck. That’s because in addition to all the great Prime Day deals we’re expecting to see on June 21 and 22, Amazon also has a promotion right now that can help you save even more money on many products sold by the online retailer when you use cash back from select Discover cards.

Depending on which offer you’re targeted for, you can score as much as 30% off on most products sold directly by Amazon with a maximum discount of $30, or 40% off up to a maximum of $40. Other Discover card holders are seeing $30 off a $150 purchase or $10 off $50.

Amazon

Get as much as 40% off at Amazon with your Discover credit card.

If you’re eligible for any of these offers, you’ll need to use Discover cash back to pay for at least a portion of your purchase at checkout to trigger the discount before the promotion expires at the end of Amazon’s Prime Day event on June 22. And if you previously saw one version of the offer, you might now be targeted for a different version.

But there are a number of steps you need to follow first to actually lock in the savings from any of these offers, so we’ve put together a step-by-step guide to ensure you’re getting every penny.

For starters, in order to potentially be targeted for this promotion, you must have a Discover credit card. These include the Discover it® Cash Back, the Discover it® Miles and the Discover it® Chrome.

If you have one of these cards but haven’t connected your Discover card to your Amazon account, you’ll need to link your two accounts. Log in to Amazon and add your Discover card as a payment method, then look for the option to enroll in “Shop with Points” under the “Your Account” tab (or click here to get to Shop with Points). On the next screen, click the “Enroll” button for the Discover card you just added.

Amazon

Add your Discover credit card to your Amazon account and enroll in “Shop with Points.”

Once your accounts are linked, you’ll need to click here to check if you’re eligible for the 30% or 40% off offers, and here to check if you’re eligible for the $10 or $30 off offers. Since these are targeted promotions, you might see a message saying that you’re not eligible, even if you have a Discover card connected to your Amazon account. But if you just enrolled in “Shop with Points,” you may need to wait 24 hours for Amazon’s records to refresh before being able to see an offer.

Related: Lower your expenses by getting one of these credit cards with no annual fee.

If you’re eligible, make sure to activate your offer by clicking on the “Activate promotion” button. You can then shop at Amazon as you normally would, but during the checkout process, you’ll want to select your linked Discover card as your payment method.

You’ll then need to apply at least 1 Discover cash back point to pay for your purchase to trigger the discount. Amazon might automatically default to applying points for the full purchase amount, but you can manually change it and designate the number of points you want to apply toward your purchase — as little as 1 point if you want. The rest of the purchase can then be paid for with your Discover card.

Amazon

You only need to apply 1 Discover cash back point to your Amazon order to get the discount.

Fortunately, you’ll get the same value when redeeming your Discover cash back at Amazon as you’d receive if you chose a statement credit redemption instead. Basically, $1 in cash back equals $1 at Amazon, which means you’re getting the same 1 cent per point. This is a much better value than what you’d receive when using American Express or Chase points, who often run similar Amazon promotions for their own card members.

Related: Save money at Amazon with targeted American Express cards.

Once you’ve applied at least 1 point to your payment, you’ll see the discount added to your order, but keep in mind you’ll only see the discount on items sold directly by Amazon, not most third-party sellers.

With the 30% or 40% off offer, the discount will apply on every order you place through June 22 until you hit a total of $40 in savings. But for the other offers, you’ll need to place a single order with the minimum purchase amount to see the savings appear. So for the $30 offer, you need a minimum of $150 in items sold by Amazon in your cart, while the $10 offer requires at least $50 worth of items.

Any of these promotions will save you money, but let’s look at a few examples to see how the various versions of the discount work.

As of this writing, Amazon has the TCL 40-Inch 1080p Roku TV on sale for just $249.99. But if you have the 40% off offer, you can snag this LED television for just $209.99, plus taxes and shipping, once the maximum $40 Discover discount is applied.

Amazon

Use the 40% version of the Discover discount to save as much as $40 on this TCL 40-inch TV.

Or, in our guide to the best thermometers of 2021, we chose the Braun Digital No-Touch Forehead Thermometer as our best overall thermometer. It’s currently on sale at Amazon for $46.09, but if you’re targeted for the 40% off Discover discount, add it in and the price drops to a super-low $27.65 before taxes and shipping.

Amazon

If you’re targeted for the 40% off Discover discount, you could get this top-notch thermometer for less than $30.

You can even pair these promotions with many of Amazon’s daily deals or any of its other money-saving offers, like saving $20 when you spend $60 on select beauty products.

Related: Pay off your debt faster with these balance transfer credit cards.

While these Discover discounts don’t apply to Amazon gift cards, they do apply to many other third-party retailer gift cards that Amazon sells. And Amazon literally has hundreds of options, including merchants such as Netflix, DoorDash, Safeway and more.

Amazon

Take as much as $40 off your grocery bill by buying a gift card to Whole Foods and applying the 40% off Discover offer.

So even if you don’t have anything you need at Amazon at the moment, you can buy a gift card for yourself using the discount and bank the savings for later.

If you’re not targeted for any of these particular Discover promotions, keep checking back, as sometimes previously ineligible customers are suddenly eligible. Similar offers also resurface throughout the year, so there’s a chance you’ll be able to receive savings at another point down the line.

You can also see if you’re eligible for a similar promotion Amazon currently has on American Express cards that could score you a discount if you’re targeted, or an offer for Chase credit card holders at Amazon right now.

If you happen to be eligible for both one of the Discover offers and an offer with another credit card, you could be looking at a total of well over $50 in savings. But keep in mind that you can’t combine points from different credit card programs on a single purchase.

And if you don’t have any of these credit cards, make sure you check out our guide to be sure you’re using the best credit card for your Amazon Prime Day purchases, even if you can’t get any discounts right now.

With Amazon being a go-to shopping site for many households during Prime Day, this promotion is the perfect way to save money if you’re eligible. So make sure you take a look if you’re a Discover credit card holder, and if you’re targeted, get your discount when you buy from Amazon!

Check out CNN Underscored’s list of the 20 Amazon products our readers were obsessed with in May.

Find all the latest personal finance deals, news and advice at CNN Underscored Money.