# Attach Campaign to Promotion

Attach a coupon campaign to a specific promotion.

  NoticeThis API call does not contain the project_id path-parameter, so you need to use the API key that is valid in all the company’s projects to set up authorization.

Endpoint: PUT /merchants/{merchant_id}/promotions/{promotion_id}/coupons
Version: 2.0
Security: basicAuth

## Path parameters:

  - `merchant_id` (integer, required)
    Merchant ID.

  - `promotion_id` (integer, required)
    Promotion ID.

## Request fields (application/json):

  - `campaigns` (array, required)
    Array of campaigns IDs.
    Example: [9135]


## Response 204 fields