curl --request POST \
  --url https://my.server.express/api/v1/client/coupons/validate \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "code": "<string>",
  "planId": "<string>",
  "quantity": 5,
  "addonIds": [
    "<string>"
  ]
}
'

const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({code: '<string>', planId: '<string>', quantity: 5, addonIds: ['<string>']})
};

fetch('https://my.server.express/api/v1/client/coupons/validate', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://my.server.express/api/v1/client/coupons/validate"

payload = {
    "code": "<string>",
    "planId": "<string>",
    "quantity": 5,
    "addonIds": ["<string>"]
}
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

{
  "success": true,
  "data": {
    "valid": true,
    "code": "<string>",
    "amountOff": 123,
    "subtotalBefore": 123,
    "subtotalAfter": 123,
    "currency": "<string>",
    "recurring": true,
    "description": "<string>"
  }
}

{
  "success": false,
  "error": "<string>"
}

{
  "success": false,
  "error": "<string>"
}

{
  "success": false,
  "error": "<string>"
}

{
  "success": false,
  "error": "<string>"
}

{
  "success": false,
  "error": "<string>"
}

{
  "success": false,
  "error": "<string>"
}

{
  "success": false,
  "error": "<string>"
}