Once you have purchased some vouchers (see How do I purchase stock to vend?) you will be able to sell those vouchers to your customers at face value. When you purchase the vouchers you will be purchasing at a discount to face value and the difference will be your profit margin. The more data you buy the larger the discount.
To vend vouchers you can do it from either of the two inventory lists. There is one on the dashboard that looks like this:
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