> ## Documentation Index
> Fetch the complete documentation index at: https://docs.hypersender.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Get LID by Phone Number

> Resolve an @c.us chat ID to its @lid value when the mapping is already known by your Hypersender instance.

Resolves a phone-number-based chat ID to its linked identifier.

<Warning>
  If you send the full `@c.us` value in the URL path, encode `@` as `%40`. Example: `3333333%40c.us`.
</Warning>

<Note>
  You can send either the full identifier, such as `3333333@c.us`, or only the numeric part when that fits your integration.
</Note>

If the mapping is missing, your instance does not currently know how to convert that `@c.us` value.

## Response Example

```json theme={null}
{
  "lid": "1111111@lid",
  "pn": "3333333@c.us"
}
```


## OpenAPI

````yaml v2/api-reference/whatsapp/whatsapp-collection.json GET /{instance}/lids/pn/{phoneNumber}
openapi: 3.1.0
info:
  version: v2.0
  title: Hypersender WhatsApp API Docs
  description: >

    The Hypersender WhatsApp API is a powerful api to send and recieve messages
    using your own whatsapp number.

    Without the high costs of Meta's Whatsapp business API.


    In this Docs you'll learn how to use and integrate Hypersnder Whatsapp API
    into your existing system/service or application using simple API endpoints.


    ## What's New in V2?


    **Queued Responses:** All requests in V2 are now queued for improved
    reliability and performance. When you make a request, you'll receive an
    immediate response with a `queued_request_uuid` that you can use to check
    the status of your request.


    **Example Response:**

    ```json

    {
        "queued": true,
        "message": "Processing your request...",
        "queued_request_uuid": "a0816120-7e37-4e8b-8cf3-92deb2cdc133",
        "queued_request_link": "https://app.hypersender.com/api/whatsapp/v2/{instance}/queued-requests/{queued_request_uuid}"
    }

    ```


    Use the `queued_request_link` or the **Get Queued Request** endpoint to
    check the actual message response once it's processed.


    **What you can Do?**


    - Send Text and basic Url messages.

    - Send Media through Link or uploaded file.

    - Send Audio through Link or uploaded file.

    - Send Contact Card

    - Send Location

    - Send Poll votes


    **You can also**


    - React to a message

    - Forward messages to other chats

    - Acknowledge messages (mark as read)

    - Star and unstar messages



    <hr />


    **Quick Demo**

      **Learn how to use Hypersender whatsapp API to send a message using Postman:**
      [Demo Link](https://app.hypersender.com/send-whatsapp-message-in-postman) **to easily interact with our API.**

    <hr />


    **postman collection**


    You can download our [Postman
    Collection](https://docs.hypersender.com/whatsapp-postman-collection.json)
    to easily interact with our API.


    ## Servers (Endpoints)


    - Production (activated):
    [https://app.hypersender.com/api/whatsapp/v2](https://app.hypersender.com/api/whatsapp/v2)
servers:
  - url: https://app.hypersender.com/api/whatsapp/v2
    description: Production
security:
  - Authorization: []
paths:
  /{instance}/lids/pn/{phoneNumber}:
    get:
      tags:
        - Contacts
      summary: Get LID by phone number
      description: Resolve a phone-number-based chat ID to its linked identifier.
      parameters:
        - name: Accept
          in: header
          description: application/json
          schema:
            type: string
            example: application/json
        - name: Content-Type
          in: header
          description: application/json
          schema:
            type: string
            example: application/json
        - name: instance
          in: path
          description: Instance UUID copied from hypersender dashboard
          required: true
          schema:
            type: string
            example: '{{ instance_id }}'
        - name: phoneNumber
          in: path
          description: >-
            The phone-number-based identifier to resolve. Encode `@` as `%40`
            when sending the full value in the path.
          required: true
          schema:
            type: string
            example: 3333333%40c.us
      responses:
        '200':
          description: Successful response
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/LidMapping'
              examples:
                Default:
                  value:
                    lid: 1111111@lid
                    pn: 3333333@c.us
        '404':
          description: Not Found
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/NotFoundError'
        '422':
          description: Validation Error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ValidationError'
        '500':
          description: Internal Server Error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ServerError'
      security:
        - Authorization: []
components:
  schemas:
    LidMapping:
      type: object
      properties:
        lid:
          type: string
          description: Linked identifier for the contact
          example: 1111111@lid
        pn:
          type: string
          description: Phone-number-based chat ID for the same contact
          example: 3333333@c.us
      required:
        - lid
        - pn
    NotFoundError:
      type: object
      title: NotFoundError
      example:
        message: Resource not found.
      properties:
        message:
          type: string
      x-examples:
        Example 1:
          message: Resource not found.
      x-stoplight:
        id: ar3vz55asbxme
    ValidationError:
      type: object
      title: ValidationError
      properties:
        message:
          type: string
        errors:
          type: object
          description: Invalid or missing feilds will be shown here
        statusCode:
          type: number
      example:
        message: The given data was invalid.
        errors: {}
        statusCode: 422
      required:
        - errors
        - statusCode
      x-examples:
        Multiple fields Error:
          message: The given data was invalid.
          errors:
            messages:
              - The number you want to send the message to is not on whatsapp.
            jid: 20121323124131@s.whatsapp.net
            exists: false
          statusCode: 422
        'Single Field error ':
          message: The given data was invalid.
          errors:
            messages:
              - textMessage.text should not be empty
          statusCode: 422
      x-stoplight:
        id: 90x3wfxw7gqcb
    ServerError:
      type: object
      title: ServerError
      properties:
        message:
          type: string
      example:
        message: Internal Server Error
      x-stoplight:
        id: 2fhq2gihsfreh
  securitySchemes:
    Authorization:
      type: http
      scheme: bearer

````