curl --request POST \
  --url https://mock-api.cevro.ai/v1/players/{playerId}/cancel-bonus \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --header 'X-Session-ID: <x-session-id>' \
  --data '
{
  "reason": "Player request"
}
'

{
  "success": true,
  "message": "<string>",
  "cancelled_bonuses": [
    "<string>"
  ],
  "new_bonus_balance": 123,
  "transaction_id": "<string>"
}