curl --request POST \
  --url https://api.mysubwallet.ng/api/exam \
  --header 'Authorization: <api-key>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "exam": 1,
  "quantity": 1,
  "request-id": "RESULTCHECKER_1234567890"
}
'

{
  "status": "success",
  "message": "Pin purchased.",
  "pins": [
    {
      "pin": "123456789012",
      "serial": "WRN123456789"
    }
  ],
  "newbal": 109200,
  "system": "API"
}