curl --request POST \
  --url https://api.lightspark.com/grid/2025-10-13/sandbox/cards/{id}/simulate/return_reversal \
  --header 'Authorization: Basic <encoded-value>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "cardTransactionId": "Transaction:019542f5-b3e7-1d02-0000-000000000100"
}
'

const options = {
  method: 'POST',
  headers: {Authorization: 'Basic <encoded-value>', 'Content-Type': 'application/json'},
  body: JSON.stringify({cardTransactionId: 'Transaction:019542f5-b3e7-1d02-0000-000000000100'})
};

fetch('https://api.lightspark.com/grid/2025-10-13/sandbox/cards/{id}/simulate/return_reversal', 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  \"cardTransactionId\": \"Transaction:019542f5-b3e7-1d02-0000-000000000100\"\n}")
val request = Request.Builder()
  .url("https://api.lightspark.com/grid/2025-10-13/sandbox/cards/{id}/simulate/return_reversal")
  .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,
  "code": "INVALID_INPUT",
  "message": "<string>",
  "details": {
    "errors": [
      {
        "field": "identifier",
        "constraint": {
          "format": "email",
          "pattern": "^\\d{5}(-\\d{4})?$",
          "enum": [
            "SSN",
            "ITIN",
            "NON_US_TAX_ID"
          ],
          "minLength": 1,
          "maxLength": 500
        },
        "message": "Value is not one of the allowed enum members."
      }
    ]
  }
}

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

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

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

{
  "status": 409,
  "code": "TRANSACTION_NOT_PENDING_PLATFORM_APPROVAL",
  "message": "<string>",
  "details": {}
}

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