WhatsApp API Platform
Template Messages

Send Template with Body Variables + Attachment

POST
/api/v1/messages/send#template-body-vars-attachment

Send a template message with body variables and a media header attachment.

Authorization

ApiKeyAuth
X-API-Key<token>

API key from your dashboard (Settings > API Keys)

In: header

Header Parameters

X-AGENT-ID?string

Optional. Attribute this send to a specific agent, overriding the agent bound to the API key. The agent must belong to your account and be active (role AGENT, parent = your account) — otherwise the request returns 400. Drives customer assignment, agent allotment limits, and the wallet ledger entry.

Request Body

application/json

TypeScript Definitions

Use the request body type in TypeScript.

Response Body

application/json

application/json

application/json

application/json

application/json

application/json

curl -X POST "https://loading/api/v1/messages/send#template-body-vars-attachment" \  -H "X-AGENT-ID: agt_abc123" \  -H "Content-Type: application/json" \  -d '{    "to": "919876543210",    "message": {      "message_type": "template",      "template_name": "invoice_reminder",      "template_language": "en_US",      "body_variables": [        "John",        "INV-2026-001",        "₹15,000"      ],      "attachments": {        "type": "document",        "attachment": "https://example.com/invoice-2026-001.pdf",        "file_name": "Invoice-2026-001.pdf"      }    }  }'
{
  "success": true,
  "data": {
    "id": "clx9abc123def456"
  }
}
{
  "success": false,
  "message": "to field is required"
}
{
  "success": false,
  "message": "user not authenticated"
}
{
  "success": false,
  "message": "insufficient balance to send message"
}
{
  "success": false,
  "message": "template not found"
}
{
  "success": false,
  "message": "internal server error"
}

Send Template with Body Variables POST

Send a template message with dynamic body variables. Variables are substituted into the template body in order (`{{1}}`, `{{2}}`, etc.).

Send Template with a Dynamic-Link Button POST

Send a template that has a dynamic-link URL button. Pass the button under `buttons` with `button_type: dynamic_url` and `button_payload` set to the full destination URL. The server proxies the URL through a tracked dynamic link and substitutes a per-recipient short slug into the template's dynamic-link button, so clicks are attributed to the recipient. Only valid for template messages. `button_index` must point at a dynamic-link button in the approved template; otherwise the request returns `400`.