If you encounter difficulties with your $25 GOOGLE Play Promo Credit that came with your Samsung Galaxy Centura, it's fairly easy to rectify.
As mentioned on other threads, some of these cards are scratch-off, while others are peel-off. It's virtually impossible to differentiate. Mine was the latter, however, when I attempted to remove the plastic strip, several of the code's numbers came with it and shredded. Attempting to recover and restore them was futile.
IMPORTANT: DO NOT DISPOSE OF THE CARD! Keep it for proof of malfunction or damage.
On the website - triplew.thepromocard.c*o*m/tracfoneHSN, (omit the asterisks) - there's a form where you can report any problems you've encountered. I completed the form and was promised a reply within 48 hours. Surprisingly, I got an e-mail within hours, asking me to submit a picture of the damaged card via e-mail to GOOGLE Play Promos for a replacement. I did and by return e-mail, they sent a new code and a link to the redemption form. When I entered the new code, it worked. Immediately, it showed that I had a balance of $25 to purchase music, videos, books, apps, etc. from the GOOGLE Playstore.