This deal is for $5 USD free Amazon credit for opening the official Amazon mobile app.
You can use the credit within the app or on the website.
Here is the process:
You must click a referral link while using a mobile device (if not it will just direct you to do so). Note: the main link for the deal is not a referral link – you can use the wiki or my link at the end of the post.
You will either be prompted to download the Amazon app or it will launch if it is already installed.
After launching the App it will prompt you to verify your mobile number & send a confirmation SMS code.
Enter the code within the app & the credit will then apply to your account (if you go through checkout you will see it). You will also receive an confirmation email from Amazon.