Buying with your product / service means buying at a discount.
By using your product / service you automatically reduce the cash outlay and the net cost on those purchases. This is because your product / service costs you less to supply than its market value, the difference being your gross profit margin. Since Contra4Business charge a transaction fee of 8.25% on purchases ( no fees are charged on sales ) this must be factored into the equation.
Brief example;
You have a product / service which has a gross profit margin of 30%. This means that for every €100.00 worth of extra product / service you supply a customer, the additional cost ( materials, labour, distribution etc. ) to you will be €70.00. This means your cost of sales is 70%.
You are about to spend £10,000 on printing for a new brochure. If you pay for your printing as normal with cash, the cost to you will be £10,000. However, if you pay with your product / service via your Contra4Business account, the cost to you ( i.e.; cash outlay ) will be;

Summary: You have used £10,000 worth of your own product / service to buy £10,000 worth of printing at a total cost to you of £7,825, representing a net saving of £2,175. Obviously the greater your gross margin is then the greater the savings you will make.