Hello everyone! Today I will be talking about the trick that allows you to get infinite money from the Tem Shop! I wouldn't really call this a glitch, because it seems like Toby intentionally put this in the game. It isn't the most efficient way of making money, so I see why he would let something like this be in the final game. Without further ado, let's get on with it!

In order to perform the trick, you need to be in the Temmie Village. The Temmie Village is meant to be more of a 'secret' village, because it is hard to access. In Waterfall, there are some glowing mushrooms that you can turn on and off with [Z]. There is one room where you need to turn on the mushrooms to show small, narrow pathways. When you get there, turn on all of the glowing mushrooms and walk around the area. There will be an exit in the top right corner, and that is NOT where you need to go to get to the village. Keep lighting up mushrooms until you see a pathway in the bottom right corner. If you walk down that pathway, you will access the Temmie Village, where there is non-hostile Temmies. The shop is located in the center-top part of the village, so explore a little bit to find that. If you are past the location, or are worried about going too far, don't worry; the game has a lot of little stops for backtracking or getting back to previous rooms.

When you go to the Tem Shop, it will appear like most of the other shops. There will be a Buy, Sell, About, and Exit page. Did you know the Tem Shop is the only shop that actually will buy your stuff? That's one of the factors for this glitch. When you go to buy, there will be:
Tem Flake: 3G
Tem Flake (on sale!): 1G
Tem Flake (expensive): 20G
and the last one can be one of the following, depending on the circumstances
Tem Flake (premium): 200G
Tem Pay for College: 1000G
Temmie Armor: 500-9999G

Buy the Tem Flakes that are on sale (as many as you can carry), and then, you can sell them back for a total of 2G. This works in all three playthroughs: Pacifist, Neutral, or Genocide (No Mercy).
Here's a YouTube video explaining it:
I personally use applications to repeat certain actions until a given time, so I can farm gold overnight. It isn't very effective, but using an application can get you tons of gold.

Thanks for the comments guys!