So, I was changing from EssentialX to CMI this morning and the sign shop seems to be not working anymore. It's says that I don't have money to pay. It might be related to the eco-system change, and signshop is not aware of this change and recreating new signshop won't solve the problem either. Can you help me? Thank you.

Make sure Essentials isn't still in the plugin folder. Make sure CMI economy is enabled fully and using Vault. Make sure the correct Vault version is being used. CMI needs a special one, it is listed on the CMI page.

Alright, I'll do that in a minute. Btw, does punching a chest with item to set up shop still working? Because it's not working on my end.

Punching with the actual item is not a feature. You put the item in the chest in the quantity you want to sell and make a sign. Then hit the chest with redstone and then hit the sign with the redstone. Then fill the shop. For faster support you can join the Discord, btw.

Yeah everything has been sorted out. I remember that I read about it somewhere tho. Thank you and sorry for the really late reply!