{
  "type": "context_match_request",
  "request_id": "ctx-retail-8f3a",
  "property_rid": "01916f3a-e7ba-7000-8000-000000000040",
  "property_id": "grocery-retailer-web",
  "property_type": "website",
  "placement_id": "search-results-sponsored",
  "seller_agent_url": "https://grocery-retailer.example",
  "artifact_refs": [
    { "type": "custom", "value": "search:beverages-coffee" }
  ]
}

{
  "type": "context_match_response",
  "request_id": "ctx-retail-8f3a",
  "offers": [
    {
      "package_id": "pkg-coffee-sponsored",
      "brand": { "domain": "coldbrew.example.com", "brand_id": "coldbrew" },
      "price": { "amount": 2.50, "currency": "USD", "model": "cpc" },
      "summary": "Cold brew and iced latte — buy 2 get 1 free promotion",
      "creative_manifest": {
        "format_id": { "agent_url": "https://grocery-retailer.example.com", "id": "sponsored_product_listing" },
        "assets": {
          "items": {
            "type": "product",
            "items": [
              { "gtin": "gtin-cold-brew-12oz", "badge": "BOGO", "image_url": "https://cdn.example.com/cold-brew-12oz.jpg" },
              { "gtin": "gtin-iced-latte-4pk", "badge": "PROMO", "image_url": "https://cdn.example.com/iced-latte-4pk.jpg" }
            ]
          },
          "promo_banner": {
            "url": "https://cdn.example.com/banners/b2g1.png",
            "width": 728,
            "height": 90
          }
        }
      },
      "macros": {
        "click_tracker": "https://track.example.com/click?pkg=coffee-sponsored",
        "impression_tracker": "https://track.example.com/imp?pkg=coffee-sponsored"
      }
    }
  ]
}

{
  "type": "identity_match_request",
  "request_id": "id-retail-c7b2",
  "seller_agent_url": "https://retailer.example",
  "identities": [
    { "user_token": "tok_loyalty_m3p7", "uid_type": "publisher_first_party" },
    { "user_token": "a1b2c3d4e5f67890abcdef...", "uid_type": "hashed_email" }
  ],
  "package_ids": ["pkg-coffee-sponsored", "pkg-snacks-display", "pkg-dairy-promo", "pkg-bakery-seasonal", "pkg-frozen-meals", "pkg-household-q1"]
}

{
  "type": "identity_match_response",
  "request_id": "id-retail-c7b2",
  "eligible_package_ids": [
    "pkg-coffee-sponsored",
    "pkg-snacks-display",
    "pkg-bakery-seasonal",
    "pkg-frozen-meals"
  ],
  "serve_window_sec": 60
}

Shopper searches "cold brew"
  → Retailer sends Context Match: coffee sponsored package available
  → Buyer: offer with creative manifest (cold brew + iced latte items, promo banner, badges)

  → (fuzzed) Retailer sends Identity Match: loyalty token + all active package IDs
  → Buyer: eligible_package_ids includes pkg-coffee-sponsored, serve_window_sec: 60

  → Retailer joins: accept offer, render items from creative manifest
  → Render sponsored carousel in search results