curl --request GET \
  --url https://api.interchange.io/api/v2/buyer/campaigns/{campaignId} \
  --header 'Authorization: Bearer <token>'

{
  "campaign": {
    "campaignId": "cmp_987654321",
    "advertiserId": "12345",
    "name": "Summer 2025 Campaign",
    "status": "DRAFT",
    "optimizationApplyMode": "AUTO",
    "createdAt": "2025-01-15T10:30:00Z",
    "updatedAt": "2025-01-20T14:45:00Z",
    "mediaBuyRefs": [
      {
        "mediaBuyId": "mb_ETBn4gJ9Wu",
        "status": "ACTIVE"
      }
    ],
    "campaignType": "DECISIONED",
    "brief": "<string>",
    "flightDates": {
      "startDate": "2025-01-15T00:00:00Z",
      "endDate": "2025-03-31T23:59:59Z"
    },
    "budget": {
      "total": 1,
      "currency": "USD",
      "dailyCap": 1,
      "pacing": "EVEN"
    },
    "mediaBudget": {
      "total": 1,
      "currency": "<string>"
    },
    "fees": [
      {
        "label": "<string>",
        "amount": 1,
        "currency": "<string>",
        "pricingType": "MARGIN",
        "marginPercent": 1,
        "unit": "CPM",
        "unitPrice": 1
      }
    ],
    "allocatedBudget": 7500,
    "unallocatedBudget": 2500,
    "pacingPeriods": {
      "mode": "weight",
      "periods": [
        {
          "label": "<string>",
          "start": "<string>",
          "end": "<string>",
          "weight": 5,
          "budget": 1
        }
      ]
    },
    "constraints": {
      "channels": [
        "<string>"
      ],
      "countries": [
        "<string>"
      ]
    },
    "storefronts": [
      {
        "id": 42,
        "platformId": "acme-media",
        "name": "Acme Media"
      }
    ],
    "performanceConfig": {
      "optimizationGoals": [
        {
          "kind": "event",
          "eventSources": [
            {
              "eventSourceId": "website_pixel",
              "eventType": "page_view",
              "customEventName": "<string>",
              "valueField": "value",
              "valueFactor": 1
            }
          ],
          "target": {
            "kind": "cost_per",
            "value": 25
          },
          "attributionWindow": {
            "postClick": {
              "interval": 7,
              "unit": "days"
            },
            "postView": {
              "interval": 1,
              "unit": "days"
            }
          },
          "priority": 1
        }
      ]
    },
    "catalogId": 42,
    "discoveryId": "session_abc123",
    "productCount": 15,
    "products": [
      {
        "productId": "prod_123"
      }
    ],
    "audiences": [
      {
        "audienceId": "aud_123",
        "name": "Tech Enthusiasts 25-34",
        "status": "READY",
        "type": "TARGET",
        "enabledAt": "2025-03-01T12:00:00Z"
      }
    ],
    "creativeFormats": {
      "required": [
        {
          "agent_url": "<string>",
          "id": "<string>"
        }
      ],
      "covered": [
        {
          "agent_url": "<string>",
          "id": "<string>"
        }
      ],
      "missing": [
        {
          "agent_url": "<string>",
          "id": "<string>"
        }
      ]
    },
    "mediaBuys": [
      {
        "mediaBuyId": "<string>",
        "name": "<string>",
        "status": "<string>",
        "createdAt": "2023-11-07T05:31:56Z",
        "updatedAt": "2023-11-07T05:31:56Z",
        "startTime": "2025-04-14T00:00:00Z",
        "endTime": "2025-04-30T23:59:59Z",
        "products": [
          {
            "productId": "<string>",
            "salesAgentName": "<string>",
            "budget": 123,
            "budgetCurrency": "<string>"
          }
        ],
        "packages": [
          {
            "packageId": "<string>",
            "status": "<string>",
            "productIds": [
              "<string>"
            ],
            "budget": 123,
            "budgetCurrency": "<string>",
            "pacing": "<string>",
            "bidPrice": 123,
            "delivery": {
              "impressions": 123,
              "spend": 123,
              "clicks": 123
            }
          }
        ],
        "optimizationGoals": [
          {
            "kind": "metric",
            "metric": "clicks",
            "reach_unit": "individuals",
            "target_frequency": {},
            "view_duration_seconds": 123,
            "target": {
              "kind": "cost_per",
              "value": 123
            },
            "priority": 123
          }
        ]
      }
    ],
    "dataDelivery": {
      "outputs": [
        {
          "outputConfigId": "<string>",
          "dataDeliveryType": "MB_DELIVERY",
          "cadence": "HOURLY",
          "enabled": true,
          "deliveryConfig": {
            "type": "GCS",
            "bucket": "<string>",
            "pathPrefix": "",
            "format": "JSONL"
          },
          "source": "advertiser",
          "createdAt": "<string>",
          "updatedAt": "<string>",
          "syncWeeklyDay": 3
        }
      ]
    },
    "frequencyCaps": [
      {
        "max_impressions": 3,
        "window": {
          "interval": 123,
          "unit": "seconds"
        },
        "id": "12345",
        "targetLevel": "ADVERTISER",
        "targetId": "camp_abc123",
        "createdAt": "<string>",
        "updatedAt": "<string>",
        "archivedAt": "<string>"
      }
    ]
  }
}