I have gotten this deal before from BoA which I did and got the credit successfully.
Last time I bought a case and some charging cables. But I remember ppl paying bills and still getting the credit. Links to previous deals below.
I just got this deal again added to my account.
Earn $75 cash back when you make two transactions with AT&T wireless using your eligible card associated with this offer.
Offer expires 6/19/2017. Must make two separate transactions with AT&T on wireless products or services of at least $15.00 on the card associated with this offer by 8/3/2017. Your $75 cash back is earned within 30 days after making your second transaction. See offer details. Taxes, fees, other charges & restrictions may apply. Add'l speed, usage, and other restrictions apply. See plan details. Offer valid one time only.
Previous reference threads:
I bet many people have done this before and made different kind of purchases. Please add your experience in Wiki to avoid redundant questions and doubts.