For that purpose registry modification would be enough, you can run regedit and find the destination below
Computer\HKEY_CURRENT_USER\SOFTWARE\Fatal Fire Studio\FAP NIGHTS AT FRENNIs
Then find the value starting with "XP_" and modify it, pick decimal as the base and enter a value.
(The value might not be there if the player hasn't completed at least one session that would make changes to the amount of money, i.e. winning or losing a game, after that it's created)
As for if the method I used for unlocking the scenes can be used again for controlling the money, it can be. After taking a quick look:
- GameTRANCISCONTROL: Controls the amount of money lost & earned due to missions/actions.
- CONTROL_DINEROS: Retrieves the amount of money the player possesses from the registry, can also be set manually for a fixed amount after changing Start, Update and ACTUALIZATION (for displaying the amount). I.E. "CONTROL_DINEROS.m_XP = PlayerPrefs.GetInt("XP");" > "CONTROL_DINEROS.m_XP = 999999;"
- CONTROL_TIENDA: Controls the prices for skins, objects etc. The fields can be altered to change the price.
DnSpy can be used for modding so many things easily if the dlls are open source and not obfuscated.
[Extra info for those interested in modding]
As for modding assets such as textures, audio: Asset Studio GUI can be used for displaying and exporting assets used, Asset Bundle Extractor can be used for importing modified assets into the game, DevX can also be used and offers many features but it's paid. Some of the skin textures as .png files can be found inside "sharedassets2.assets & "sharedassets4.assets" which are located inside "FAP NIGHTS AT FRENNIs_Data" and overwriting any of those should change the corresponding texture in-game.