So, this map was a bit confusing and I see a lot of being bashing it since they don't get it. I'll give a simple walkthrough to get to the buyable ending.

PaP: There's three numbers you use to unlock the PaP. They're randomized.
Red is located in the Simpsons house (next to mystery box location.)
Blue is in Moe's Bar, directly to the left as you enter.
Green is unknown, I could not find it no matter how hard I looked: luckily you really don't need it lol.

How to unlock PaP: You enter the three numbers into the dial in the sewers by shooting the number below each color. Once you have them entered, you hold F to check and it will unlock PaP.

Buyable Ending Guide:
First off, you'll need to shoot down the bomb that's hanging from the sky near the front of Ned's house. Once you do this, you activate the bomb which gives you a time-limit. You have to find three pliers before this bomb goes off.

To get the pliers, you have to feed souls to donuts around the map. There's one behind Simpsons house, one behind Neds house, and various infront of the Simpsons and Neds house.
Once these are done and you have all pliers, you interact with the Bomb three times and then a final fourth time to turn it off.

To get the buyable ending fully, you have to activate the switches around the map in a specific order. I'm not entirely sure if this is randomized, but for me it was this:
The one on the right side of Moe's Bar -> One to the left of Moe's Bar (next to the outside Mystery Box spot.) -> The one in the backyard of the Simpsons house -> The one in Ned's house -> and finally the one next to the Simpson's car.

That should cover it, if I made any mistakes lmk and I'll fix it.