The below describes how Magnite DV+ SSP passed the iris_id into the bidstream.
Magnite DV+ passes the iris_id to DSPs via the content.id field. See the following example for where to locate the iris_id on Magnite DV+ ad requests.
Example of the iris_id in the content.id field in the content object:
“content”: {
        “id”: “iris_f837enao93h7f5ni2”,
        “title”: “[title]”,
        “series”: “[series]”,
        “cat”: “[category]”,
        "keywords": "[keywords]"
        “contentrating”: “TV-PG”,
        “context”: 1,
“producer”: “[producer]”,
“id”: “[network]”,
“name”: “[network_name]”
},
“len”: “[seconds]”,
“genre”: “Comedy”
}