What is the main conflict in The Devil and Tom Walker by Washington Irving?

"The Devil and Tom Walker," by Washington Irving, is a short story originally published in 1824, as a part of Irving's collection Tales of a Traveller. The story, which draws heavily on the German legend of Faust, is told by a frame narrator who is repeating a story that someone else told him. In this tale, a man named Tom Walker strikes a deal with the devil. In return for riches, Tom agrees to serve the devil's purposes while he lives and to give the devil his soul upon his death. Tom grows increasingly worried about the bargain he has made and vainly attempts to hide behind public piety as he plots to escape his bargain--the story thus illustrates the dangers of greed, hypocrisy, and corruption.