curl --request POST \
  --url https://{defaultHost}/v1/imports/product_collections \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "import": {
    "data": [
      {
        "name": "Test Collection",
        "description": "A test product collection",
        "slug": "test-collection"
      }
    ]
  }
}
'

{
  "id": "005bcd8a-1871-437a-9607-f82395ca12f0",
  "object": "import",
  "import_type": "product_collection",
  "live_mode": true,
  "rows_imported": 0,
  "rows_uploaded": 0,
  "status": "pending",
  "created_at": 1778010883,
  "updated_at": 1778010883
}