curl --request POST \
  --url https://your-instance.example.com/api/pipelines/set-default \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "pipelineId": "<string>"
}
'

{
  "message": "<string>",
  "pipeline": {
    "_id": "<string>",
    "name": "<string>",
    "description": "<string>",
    "organizationId": "<string>",
    "type": "Contact",
    "isDefault": true,
    "isActive": true,
    "stages": [
      {
        "name": "<string>",
        "color": "<string>"
      }
    ],
    "pipelineStageIds": [
      "<string>"
    ],
    "pipelineStages": [
      {
        "_id": "<string>",
        "name": "<string>",
        "color": "<string>",
        "position": 123
      }
    ],
    "createdBy": "<string>",
    "updatedBy": "<string>"
  },
  "contactsMigrated": {}
}