Hi @Nic , here is my idea:
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you add an attribute in your contact database called « Date of purchase », in which, when you’ll import your contacts, you’ll put the date of the last purchase
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then you create a segment called let’s say « Last purchases »: choose the contacts whose date of purchase was one day ago
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and then you create an automation based on this segment. I answered to something similar here: How to set up simple recurring email to my team? - #3 par ahudavert
Can you take a look and tell me if this could work for you as well?