Partnership Ads with Placement Asset Customization

curl -X POST \
  -F "name=My creative title" \
  -F "object_id=<FB_PAGE_ID>" \
  -F "source_instagram_media_id=<IG_MEDIA_ID>" \
  -F "facebook_branded_content={
    "sponsor_page_id": "<FB_SPONSOR_PAGE_ID>"
  }" \
  -F "instagram_branded_content={
    "sponsor_id": "<IG_SPONSOR_ID>"
  }" \
  -F "asset_feed_spec={
    "optimization_type": "PLACEMENT",
    "asset_customization_rules": [
      {
        "image_label": {
          "name": "<IMAGE_LABEL>"
        },
        "customization_spec": {
          "publisher_platforms": [
            "instagram"
          ],
          "instagram_positions": [
            "stream"
          ]
        }
      }
    ]
    // other asset feed spec fields
  }" \
  -F "access_token=<ACCESS_TOKEN>"
"https://graph.facebook.com/v26.0/act_<AD_ACCOUNT_ID>/adcreatives"

{
  "id": "<CREATIVE_ID>"
}