Found this discussion and I believe it is worthy to share how to use the API properly. It took me a while to figure it out.The contactID value you have to input actually is the contact Lookup ID (which refers to the contact in the mailing list) - you can retrieve that one using the GET contact in list or directory APIs. The prefix for the contact Lookup ID value is CGC_xxxxxxxxxxxxxxxxx. So, the body should look like that:
I really wanted a clue about this as well! Hope someone can help!The segments possibilities for dates are really limited to create these groups automatically.
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