curl --request POST \
  --url https://api.lightspark.com/grid/2025-10-13/sandbox/cards/{id}/simulate/financial_authorization \
  --header 'Authorization: Basic <encoded-value>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "amount": 8000,
  "currency": {
    "code": "USD"
  },
  "merchant": {
    "descriptor": "ATM WITHDRAWAL 24TH ST",
    "mcc": "6011",
    "country": "US"
  }
}
'

const options = {
  method: 'POST',
  headers: {Authorization: 'Basic <encoded-value>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    amount: 8000,
    currency: {code: 'USD'},
    merchant: {descriptor: 'ATM WITHDRAWAL 24TH ST', mcc: '6011', country: 'US'}
  })
};

fetch('https://api.lightspark.com/grid/2025-10-13/sandbox/cards/{id}/simulate/financial_authorization', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

val client = OkHttpClient()

val mediaType = MediaType.parse("application/json")
val body = RequestBody.create(mediaType, "{\n  \"amount\": 8000,\n  \"currency\": {\n    \"code\": \"USD\"\n  },\n  \"merchant\": {\n    \"descriptor\": \"ATM WITHDRAWAL 24TH ST\",\n    \"mcc\": \"6011\",\n    \"country\": \"US\"\n  }\n}")
val request = Request.Builder()
  .url("https://api.lightspark.com/grid/2025-10-13/sandbox/cards/{id}/simulate/financial_authorization")
  .post(body)
  .addHeader("Authorization", "Basic <encoded-value>")
  .addHeader("Content-Type", "application/json")
  .build()

val response = client.newCall(request).execute()

{
  "issuerTransactionToken": "f3a1c2d4-5b6e-7890-abcd-ef0123456789"
}

{
  "status": 400,
  "message": "<string>",
  "details": {}
}

{
  "status": 401,
  "message": "<string>",
  "details": {}
}

{
  "status": 403,
  "message": "<string>",
  "details": {}
}

{
  "status": 404,
  "message": "<string>",
  "details": {}
}

{
  "status": 500,
  "message": "<string>",
  "details": {}
}