curl --request PATCH \
  --url https://sandbox.api.riqra.com/promotions/{promotionId}/coupons/{couponId} \
  --header 'Content-Type: application/json' \
  --header 'api-key: <api-key>' \
  --data '
{
  "startDate": "2021-08-01T05:00:00.000Z",
  "expirationDate": "2021-08-31T05:00:00.000Z",
  "code": "string",
  "usageLimit": 0
}
'

{
  "errors": [
    {
      "message": "<string>",
      "code": 123
    }
  ]
}