First let's examine the produce sticker. It has the PLU clearly identified for compatibility with today's process then it has the GS1 barcode that contains a 14 digit number. In the US and Canada that number is made up of two leading zeros, the company prefix which can be 6 to 10 digits, the companies item reference code which is 2 to 5 digits (note this can be the universal product code or any other number the company decides on) with leading zeros to fill to position 13 and then the check digit. Like this - 00 123456 04011 3
Detailed at the GS1.org website below.
Now let's examine the example coupon above. It has both the UPC type 5 coupon barcode and the new GS1 Expanded stacked barcode. Above the new barcode portion is the companies prefix (0037000) and the offer code (010752) in human readable format. Embedded in the databar portion are the application identifier, primary GS1 company prefix, the offer code, primary purchase family code, primary purchase requirement, the save value and optionally the secondary purchase requirement, secondary purchase GS1 company prefix and the secondary purchase family code.
Detailed at this website -
http://www.barcode-us.com/coupon/dataBarCoupon.html
Your particular POS application needs to be set up to read and use these barcodes. In the case of the produce stickers the entire decoded number will need to be added to your item file to scan and ring up that item. In the case of the new coupon databar barcode your application will need to be able to understand the data fields and translate the offer code and value to an amount that will be discounted as a coupon amount.
For further research here are some useful links:
Here is a link to the GS1 US/Canada website: http://www.gs1us.org