On-Site Documentation

Postman Collection

Download the WhatsApp Gateway API v1 collection and configure safe placeholder variables before testing.

Download PDF Overview Quickstart Connect Instance Send Messages Receive Webhooks Responsible Messaging 3CX Overview 3CX Webhooks 3CX Call Events 3CX Troubleshooting n8n Integration Endpoint Map OpenAPI SDK Overview PHP Examples Node.js Examples Python Examples Postman Collection Troubleshooting

Postman

Import ready-made examples for sending messages, reviewing error cases, validating webhook signatures, and testing 3CX Middleware events.

Download collection OpenAPI JSON

Download the collection JSON and import it into Postman.
Open the collection variables and replace placeholder values with your own dashboard values.
Create API keys in the customer dashboard, then use them as Bearer tokens for customer API requests.
Review OpenAPI Specification for the public request and response schemas.

Environment Setup
Variable setup and docs links.

Authentication
OpenAPI fetch and Bearer token notes.

Send Message
Transactional, support, and authentication examples.

Error Scenarios
Purpose, key, instance, module, and suppression examples.

Customer Webhook Examples
Sample events your webhook receiver may receive.

3CX Middleware
Test, outbound message, and missed call examples.

Variable	Placeholder	Use
`base_url`	`https://evoapi.faisak.com`	Public WhatsApp Gateway base URL.
`api_key`	`wg_live_replace_with_your_key`	Customer API key created in the dashboard.
`instance_id`	`demo-support-line`	Customer-owned instance ID or instance name.
`phone`	`+9665XXXXXXX`	Sanitized recipient phone number for test requests.
`threecx_integration_id`	`1`	3CX integration ID from the dashboard.
`threecx_secret`	`replace_with_3cx_webhook_secret`	3CX webhook secret from the integration settings.
`webhook_signing_secret`	`replace_with_customer_webhook_signing_secret`	Customer webhook signing secret shown once in the dashboard.
`timestamp`	`2026-05-08T10:00:00Z`	Example timestamp used by webhook sample requests.

Do not commit or share real API keys, webhook signing secrets, or 3CX secrets.
Use sanitized phone numbers and demo payloads when sharing screenshots or collections.
The collection uses placeholders only. Replace them inside your private Postman workspace.