Try Amazon Cash for the first time by adding $100 or more to your Amazon Balance and earn a $20 Amazon Credit towards your next purchase on Amazon.com. Your discount will automatically be applied at checkout. This is a limited time offer, one per Amazon customer account. The promotional credit expires on March 31, 2018
Don't know if this is for new user only or not，if you see "Currently you are not eligible for this exclusive offer", click on the Amazon Cash link below and see if the offer will come up or not.
My account I'm only seeing the $25 for four times. My wife's account is getting this new one, which I liked better, only have to do it once!
Terms & Conditions
Amazon Cash transaction must occur between 12:01 am (PT) on January 1, 2018 and 11:59 pm (PT) February 28, 2018.
Offer limited to the first time a customer uses Amazon Cash.
Offer only applies to products sold by Amazon.com (look for "sold by Amazon.com" on the product detail page). Products sold by third-party sellers or other Amazon entities will not qualify for this offer, even if "fulfilled by Amazon.com" or "Prime Eligible".
Shipping charges and taxes may apply to the full value of discounted and free promotional items.
Offer limited to one per customer and account.
The maximum benefit you may receive from this offer is $20 off products sold by amazon.com.
You will receive an e-mail from Amazon that indicates the dollar amount of the promotional credit and that the dollar amount of the credit has been added to your customer account.
Promotional credit expires at 11:59 p.m. (PT) March 31, 2018.
Amazon reserves the right to modify or cancel the offer at any time.
Offer is non-transferable and may not be resold.
Offer discount will be allocated proportionally among all promotional items in your order.
If any of the products or content related to this offer are returned, your refund will equal the amount you paid for the product or content, subject to applicable refund policies.
If you violate any of these terms, the offer will be invalid.
Unless an Amazon Gift Card is the stated benefit of the promotion, promotional codes (including those placed directly in accounts) may not be redeemed for Amazon Gift Cards.