전자상거래 추적

// purchase 이벤트 — 전체 구조
dataLayer.push({ ecommerce: null });  // 이전 데이터 초기화
dataLayer.push({
  event: 'purchase',
  ecommerce: {
    transaction_id: 'T_12345',
    value: 35000,
    tax: 3500,
    shipping: 3000,
    currency: 'KRW',
    coupon: 'SPRING2026',
    items: [
      {
        item_id: 'SKU_001',
        item_name: '운동화',
        affiliation: '공식 스토어',
        coupon: 'SHOES10',
        discount: 1500,
        item_brand: 'JIT Sports',
        item_category: '신발',
        item_variant: '블랙 / 270mm',
        price: 15000,
        quantity: 1
      },
      {
        item_id: 'SKU_042',
        item_name: '양말 세트',
        item_brand: 'JIT Sports',
        item_category: '액세서리',
        price: 5000,
        quantity: 3
      }
    ]
  }
});