Here is just a copy of a tab I did based on a transcription by Mannystein, here is the original post for those who are interested: https://community.gametabs.net/t/snowdin-shop-theme-undertale/586/2
Here is the copy and paste version of what I put on the original post:
'Ok here is my version of the song based off your transcription: a good bit of work with barre chords and the ending is a bit messy to me but overall I think its playable. Let me know of your thoughts,
Undertale Shop (Guitar Version) - Full Score.pdf (54.8 KB)
Undertale Shop (Guitar Version).mid (5.0 KB)
Edit: Oh yeah, to match the recording you need to tune your strings down a half step, but this is not needed really. I may end up going back later to change the eighth notes to just quarter notes with a staccato marking to make the music seems less messy overall.'
I decided not to change the eighth notes but not sure if this was the best choice or not.