Does Amazon still offer the payout option to be put in your Amazon gift card balance? I remember this used to be an option and they would add 1% to it but I checked and no longer see this. Thank you!
Keeping in mind that the program is still being Beta tested, here is the published procedure.
[Beta] Disburse Funds to your Gift Card to shop on Amazon.com
I haven’t found any indication that the program has been withdrawn.