Can you be clearer on which fields you are referring to?
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Looks like the Push Lead API (though I agree that should have been provided in the post).
programName is, exactly as it states, the name of the program in Marketo.
lookupField is the REST API name of the field you wish to dedupe on, with the same rules as the Sync Lead API but also supporting the special field mktToken (which is unlikely to be of use to you).