I left my Fire TV 4K Max stick idle and noticed an Acura ad said to watch a video and get a $3 prime video credit.
Following the on-screen prompts, I pressed play on the ad, pressed a direction to navigate the ad, pressed enter on the $3 video, watched their ad for an electric Acura, then received an email. In the email, I clicked the redeem link and now I have another $3 Prime video credit (I did this deal in December for a different ad and still haven’t used that).
This Acura one expires 4/21/2023 7:00am GMT.
You can view your Prime Video credit balance by picking a title (for example Top Gun Maverick ) and seeing how it adjusts the price. You can also click "more purchase options" and then "Redeem a gift card or promotion code" to view your balance.