Note: The following may only work in the unpatched version of the game. Complete any side quest that does not activate a cutscene while receiving your reward, then save the game. Draw your weapon and approach the NPC. While your character is putting away their weapon to talk to the NPC, rapidly press X to get infinite money and EXP. Repeat this until you move your character. Repeat as desired.
Note: The following may only work in the unpatched version of the game. While in Kirkwall, there is a quest in the chantry called "Sister Plinth's Remains." While returning her remains to her brother, do not move as this prevents the exploit from working. Simply press the button to turn over the remains repeatedly and the brother will keep giving you the reward. Note: You find the remains in Darktown in the top right corner of the map. They are surrounded by a bunch of soldiers.