# Add Coupon to Campaign Add a coupon code to a coupon campaign. 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: POST /merchants/{merchant_id}/coupon_promotions/{campaign_id}/coupons Version: 2.0 Security: basicAuth ## Path parameters: - `merchant_id` (integer, required) Merchant ID. - `campaign_id` (integer, required) Campaign ID. ## Request fields (application/json): - `coupon_code` (string, required) Coupon code. Example: "34bryrb3" ## Response 204 fields