Thought I'd provide some advice as to using the $10 djs gift cards as I've just used 70.
1. Download barcode generator app, I'm using Samsung note 8 so I used this app
https://play.google.com/store/apps/details?id=ab.barcodereader&hl=en . I did not find a good Apple app on my wife's device that was free.
2. Select 'Generate' and go to '1D code', the format is "Code 128"
3. Sort your gift cards by ascending or descending order using excel
4. Start from the top, enter the giftcard number in the 'text' field. "share" the barcode, i sent mine to my partners WhatsApp. This way it will contain the actual card number as well as the barcode. Note down the PIN in the message, should come out like this;
View attachment 123115
I have found the 6012630 is constant then each batch of giftcards (6410) and then only the last 5 numbers you have to change. Just follow pattern so that you don't have retype too many digits.
5. Go to DJs and let them scan each barcode. PIN is not needed but I have it there incase they need to do it manually. Scanning 70 took him around 15-20mins I think. Make small talk, be nice.