How to display sales savings at checkout?

[HelenVAC]

I want to display the savings at checkout during my sale. I have a sales campaign set up using the Discounty app, and I'm using their 'Savings on Cart' widget to show the savings at checkout, however it is not showing. I reached out to the Discounty team however they are unable to fix the issue as it requires some coding changes. I am using the Impulse theme. Can anyone help to have the savings shown at checkout? Example below from the Discounty widget on how it should display:

[mani_sanomads]

@HelenVAC you can give a try to  Slice n' save  it will full fill all your requirements regarding any type of discount