Media header

curl -X POST "${WHATSAPP_API_URL}/${WHATSAPP_PHONE_NUMBER_ID}/messages" \
  -H "Authorization: Bearer ${WHATSAPP_ACCESS_TOKEN}" \
  -H "Content-Type: application/json" \
  -d '{
  "messaging_product": "whatsapp",
  "to": "15551234567",
  "type": "template",
  "template": {
    "name": "promo_launch",
    "language": {
      "code": "en_US"
    },
    "components": [
      {
        "type": "header",
        "parameters": [
          {
            "type": "image",
            "image": {
              "link": "https://example.com/banner.jpg"
            }
          }
        ]
      },
      {
        "type": "body",
        "parameters": [
          {
            "type": "text",
            "text": "Alex"
          }
        ]
      }
    ]
  }
}'