What you seek is called manufactured spending (MS). Turnbull has provided a very simple way of doing it. You can take that a step further and load those gift cards into a prepaid debit card called "Serve". Once you're able to load the gift cards into this prepaid debit card it acts like a checking account. You then can bill pay your subcontractors for however amount you have loaded into your serve card.
With serve you can load up to $5,000 a month max.
However, there are huge obstacles of doing this route. One of them is being able to find pin enabled gift cards. Second is the hassle of loading your serve at a local walmart, rite aid, family dollar, and dollar general. It's a your mileage may vary game when it comes to being able to load at any of these locations. Some are gift card friendly while others are not. Just imagine showing up with multiple gift cards and you want to load them individually to your serve card. Gives off a bad impression.
This can be lucrative to those cardholders who have the chase ink card. That card gets you 5x per $1 at any supply store. The strategy to doing this is simply buy up to $5,000 worth of visa gift cards at staples, officemax, or office depot during a gift card sale (very important during a promotion to avoid fees). Then load them to serve and pay off bills that I you normally couldn't pay with a credit card (i.e. rent/mortgage, student loans, utilities, etc). Breaking down the math you're essentially earning at least 25,000 Chase UR a month if you can maximize this.