EngageLab WhatsApp Business API Skill

This skill enables interaction with the EngageLab WhatsApp Business REST API. As a Meta-authorized WhatsApp Business solution provider, EngageLab connects businesses with over 2 billion WhatsApp users for marketing, notifications, OTP verification, and customer service.

It covers three areas:

1. Send Messages — Deliver template, text, image, video, audio, document, and sticker messages
2. Template Management — Create, list, get, update, and delete WABA message templates
3. Callbacks — Receive message delivery status, user responses, and system notifications

Resources

scripts/

• whatsapp_client.py — Python client class (EngageLabWhatsApp) wrapping all API endpoints: send_template(), send_text(), send_image(), send_video(), send_audio(), send_document(), send_sticker(), and template CRUD (list_templates(), get_template(), create_template(), update_template(), delete_template()). Handles authentication, request construction, and typed error handling.

references/

• error-codes.md — Complete error code tables for messaging and template APIs
• template-api.md — Full template CRUD specs with components object details (header, body, footer, buttons)
• callback-api.md — Webhook callback events: message status, message response, and system notifications

Authentication

All EngageLab WhatsApp API calls use HTTP Basic Authentication.

• Base URL: https://wa.api.engagelab.cc
• Header: Authorization: Basic <base64(dev_key:dev_secret)>
• Content-Type: application/json

The user must provide their dev_key (DevKey) and dev_secret (DevSecret). Encode them as base64("dev_key:dev_secret") and set the Authorization header.

Example (using curl):

curl -X POST https://wa.api.engagelab.cc/v1/messages \
  -H "Content-Type: application/json" \
  -H "Authorization: Basic $(echo -n 'YOUR_DEV_KEY:YOUR_DEV_SECRET' | base64)" \
  -d '{ ... }'

If the user hasn't provided credentials, ask them for their dev_key and dev_secret before generating API calls.

Quick Reference — All Endpoints

Operation	Method	Path
Send message	POST	/v1/messages
List templates	GET	/v1/templates
Get template	GET	/v1/templates/:templateId
Create template	POST	/v1/templates
Update template	PUT	/v1/templates/:templateId
Delete template	DELETE	/v1/templates/:templateName

Sending Messages

Endpoint: POST /v1/messages

Request Body (Template Message)

{
  "from": "+8613800138000",
  "to": ["00447911123456"],
  "body": {
    "type": "template",
    "template": {
      "name": "code",
      "language": "en",
      "components": [
        {
          "type": "body",
          "parameters": [
            { "type": "text", "text": "12345" }
          ]
        }
      ]
    }
  },
  "request_id": "my-request-123",
  "custom_args": { "order_id": "ORD-456" }
}

Parameters

Field	Type	Required	Description
from	string	No	Sending number with country code. Uses default sending number if omitted
to	string[]	Yes	Recipient WhatsApp phone numbers with country code
body	object	Yes	Message body — see message types below
request_id	string	No	Custom request ID, returned as-is in response and callbacks
custom_args	object	No	Custom data returned in message status callbacks

Message Types

The body.type field determines the message type. Only template messages can be sent to users proactively. Other types require the user to have replied within the last 24 hours.

Type	Description	24h Window Required
template	Pre-approved template message	No
text	Plain text (max 4096 chars)	Yes
image	Image (JPEG/PNG, max 5MB)	Yes
video	Video (MP4/3GPP, max 16MB)	Yes
audio	Audio (AAC/MP4/AMR/MPEG/OGG, max 16MB)	Yes
document	File (any MIME type, max 100MB)	Yes
sticker	Sticker (WebP, static 100KB / animated 500KB)	Yes

Text Message

{
  "to": ["8613800138000"],
  "body": {
    "type": "text",
    "text": { "body": "Hello, your order has shipped!" }
  }
}

Image Message

{
  "to": ["8613800138000"],
  "body": {
    "type": "image",
    "image": {
      "link": "https://example.com/photo.jpg",
      "caption": "Order confirmation"
    }
  }
}

Video Message

{
  "to": ["8613800138000"],
  "body": {
    "type": "video",
    "video": {
      "link": "https://example.com/demo.mp4",
      "caption": "Product demo"
    }
  }
}

Audio Message

{
  "to": ["8613800138000"],
  "body": {
    "type": "audio",
    "audio": { "link": "https://example.com/voice.mp3" }
  }
}

Document Message

{
  "to": ["8613800138000"],
  "body": {
    "type": "document",
    "document": {
      "link": "https://example.com/invoice.pdf",
      "caption": "Your invoice",
      "filename": "invoice_2024.pdf"
    }
  }
}

Sticker Message

{
  "to": ["8613800138000"],
  "body": {
    "type": "sticker",
    "sticker": { "link": "https://example.com/sticker.webp" }
  }
}

Template Message Components

Template messages use pre-approved WABA templates with variable substitution via components:

{
  "to": ["00447911123456"],
  "body": {
    "type": "template",
    "template": {
      "name": "order_update",
      "language": "en",
      "components": [
        {
          "type": "header",
          "parameters": [
            { "type": "image", "image": { "link": "https://example.com/product.jpg" } }
          ]
        },
        {
          "type": "body",
          "parameters": [
            { "type": "text", "text": "John" },
            { "type": "text", "text": "ORD-12345" },
            { "type": "currency", "currency": { "fallback_value": "$99.99", "code": "USD", "amount_1000": 99990 } }
          ]
        }
      ]
    }
  }
}

Parameter types: text, currency, date_time, image, video, document. Media types only appear in header components.

Response

Success:

{
  "message_id": "cbggf4if6o9ukqaalfug",
  "request_id": "my-request-123"
}

Field	Type	Description
message_id	string	Unique EngageLab message ID
request_id	string	Your custom request ID (if provided)

For error codes, read references/error-codes.md.

Template Management

WhatsApp message templates must be created and approved before use. Templates support HEADER, BODY, FOOTER, and BUTTONS components with variables.

For full request/response details including components object specs, read references/template-api.md.

Quick Summary

List all — GET /v1/templates with optional query params: name, language_code, category, status

Get one — GET /v1/templates/:templateId

Create — POST /v1/templates

{
  "name": "order_confirmation",
  "language": "en",
  "category": "UTILITY",
  "components": [
    { "type": "BODY", "text": "Hi {{1}}, your order {{2}} has shipped." ,
      "example": { "body_text": [["John", "ORD-123"]] } }
  ]
}

Update — PUT /v1/templates/:templateId (same body as create)

Delete — DELETE /v1/templates/:templateName (deletes all languages for that name)

Template Categories

Category	Description
AUTHENTICATION	Verification codes / OTP
MARKETING	Promotional content
UTILITY	Service notifications

Template Status Values

Status	Description
APPROVED	Available for sending
PENDING	Awaiting review
REJECTED	Review rejected
DISABLED	Banned
IN_APPEAL	Under appeal
PAUSED	Temporarily paused

Callbacks

Configure webhook URLs to receive message delivery status, user responses, and system notifications.

For full callback data structures and event types, read references/callback-api.md.

Message Status Events

Status	Description
plan	Scheduled for sending
target_valid	Number verified as valid
target_invalid	Number is invalid
sent	Successfully sent to Meta
delivered	Delivered to user's device
read	User has read the message
sent_failed	Failed to send
delivered_failed	Sent but delivery failed
delivered_timeout	No delivery confirmation within 5 minutes

User Response Events

Event	Description
received	User sent a direct message
reply	User replied to your message
order	User placed an order
deleted	User deleted their message

Generating Code

When the user asks to send WhatsApp messages or manage templates, generate working code. Default to curl unless the user specifies a language. Supported patterns:

• curl — Shell commands with proper auth header
• Python — Using requests library (or the bundled whatsapp_client.py)
• Node.js — Using fetch or axios
• Java — Using HttpClient
• Go — Using net/http

Always include the authentication header and proper error handling. Use placeholder values like YOUR_DEV_KEY and YOUR_DEV_SECRET if the user hasn't provided credentials.

Media Format Requirements

Type	Formats	Max Size
Image	JPEG, PNG (no transparent background)	5 MB
Video	MP4, 3GPP (H.264 video + AAC audio)	16 MB
Audio	AAC, MP4, AMR, MPEG, OGG (opus codec)	16 MB
Document	Any MIME type (PDF only for template headers)	100 MB
Sticker	WebP	Static: 100 KB, Animated: 500 KB