POST /v19.0/{PHONE_NUMBER_ID}/messages HTTP/1.1
Host: graph.facebook.com
Authorization: Bearer EAAX...
Content-Type: application/json

{
  "messaging_product": "whatsapp",
  "recipient_type": "individual",
  "to": "+919876543210",
  "type": "template",
  "template": {
    "name": "cart_recovery_dynamic_v2",
    "language": { "code": "en" },
    "components": [
      {
        "type": "header",
        "parameters": [{ "type": "image", "image": { "link": "https://cdn.brand.com/p/sneaker-42.webp" } }]
      },
      {
        "type": "body",
        "parameters": [
          { "type": "text", "text": "Priya" },
          { "type": "text", "text": "UltraBoost Light 2026" },
          { "type": "text", "text": "₹3,999" }
        ]
      },
      {
        "type": "button",
        "sub_type": "url",
        "index": "0",
        "parameters": [{ "type": "text", "text": "cart_session_9281a" }]
      }
    ]
  }
}