curl --request POST \
  --url https://public-api-demo.clearline.me/v2/pos/{posSystemId}/coupon/couponCodes/validate \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json-patch+json' \
  --data '
{
  "posLocationId": "6orMqUyq2Hg3tP",
  "code": "Sl75Ev",
  "rewardProvider": "TwoReward"
}
'

{
  "data": {}
}