I have been using one of those for two seasons, this is my third, and have had no problems with disputes. In fact, I found that when customers are paying with a credit card, they spend more money with me with the ad ons. Goes like this.
Bundle of kindling, and extra $8.00
Stacking, an extra $10.00
Chimney Sweeping, anywhere from $75.00 to $200.00 depending on many factors.
Fire starting lessons, $25.00. No, I aint kidding. To date I have collected $325.00 in firestarting lessons in two years.
And I cant even begin to tell you how many tree jobs I have picked up because of a delivery. Several times I have dropped a load of wood, looked at a tree,gave em an estimate, yanked my spurs and harness out of the truck, climbed, dropped, bucked up, and left them the mess to clean up, swiped their card, and billed right on the spot for the delivery and the dropped tree.
I always carry a bundle of kindling that is kiln dried, my climbing gear, a few ropes, a climbing saw, fuel and bar oil, and chimney sweeping tools are a phone call away. I have an agreement with a sweep where if I call, he shows up and sweeps, I bill the customer, and I keep 25 percent.