Today, when using the Bulk Lead Import endpoint with the REST API, users are given the option to declare a lookupField for deduplication matching. This allows for closer control over what versions of a record are updated--particularly if secondary forms of identification, like Marketo ID or Salesforce Lead ID, are used in lieu of email.
However, this same functionality isn't available for the Bulk Import Program Member endpoint; you are instead reliant on email for matching. Would it be possible to get lookupField support added to this call? I'm particularly interested in Marketo ID but would appreciate any other non-email matching available. This is also particularly strange in light of the one-off call for syncing program member data actually requiring the Marketo ID instead.
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