Is there any extension out there about a promo rule that if they reach $90 in their basket notify with a pop up or place banner etc... that if they spend $100 they'll get X item for free etc...?
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Not sure if it helps but i would suggest this extension for your request:
You can see the Guide before purchasing it
Also you can chat with their support for further questions .
I use some of extension of Mageplaza and they do good coding.