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Cartloom can do the following (see below)
What would I need to do to accept it?
"Cartloom will POST a JSON formatted payload to whatever URL you provide. It is up to you what to do with that data.
I recommend setting up your remote script to accept the POST and dump it so you can see what you are working with.
For example in PHP, you could do this…
Web Hook setup is available in Checkout Settings -> General -> Hooks
Hope this helps. :)"
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