# Create coupon code

Creates coupon code.

Endpoint: POST /v2/project/{project_id}/admin/coupon/{external_id}/code
Version: 2.0.0
Security: basicAuth

## Path parameters:

  - `project_id` (integer, required)
    Project ID. You can find this parameter in your Publisher Account next to the name of the project.
    Example: 44056

  - `external_id` (integer, required)
    Promotion external ID. Unique promotion identifier within the project.
    Example: "coupon_44056_1"

## Request fields (application/json):

  - `coupon_code` (string)
    Unique case sensitive code. Contains letters and numbers.
    Example: "WINTER2021"

## Response 201 fields (application/json):

  - `code` (string)
    Unique case sensitive code. Contains letters and numbers.
    Example: "WINTER2021"

## Response 401 fields (application/json):

  - `statusCode` (integer)
    Example: 401

  - `errorCode` (integer)
    Example: 1020

  - `errorMessage` (string)
    Example: "[0401-1020]: Error in Authentication method occurred"

## Response 404 fields (application/json):

  - `statusCode` (integer)
    Example: 404

  - `errorCode` (integer)
    Example: 4001

  - `errorMessage` (string)
    Example: "[0401-9802]: Coupon not found"

  - `transactionId` (string)
    Example: "x-x-x-x-transactionId-mock-x-x-x"

## Response 422 fields (application/json):

  - `statusCode` (integer)
    Example: 422

  - `errorCode` (integer)
    Example: 9803

  - `errorMessage` (string)
    Example: "[0401-9803]: The code already exists."

  - `transactionId` (string)
    Example: "x-x-x-x-transactionId-mock-x-x-x"