"The idProperty query parameter doesn't appear on the Endpoints tab due to technical limitations, but it can be used for contacts exclusively with email. To use an email address as the unique identifier, set the idProperty as email and enter the email address in place of the contact ID. This should be set as a query parameter rather than added to the request body."
Thanks @digs - I will try this later today as we do have customers with multiple emails and we want to find the correct contact no matter which email they use.
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