This is a real response from the Credit Api:
Uri: "https://api.cybersource.com/pts/v2/credits"
HttpStatusCode: 201
{
"id": "[id removed]",
"submitTimeUtc": "2021-09-19T22:12:26Z",
"status": "201",
"errorInformation": {
"reason": "PROCESSOR_DECLINED",
"message": "Decline - General decline of the card. No other information provided by the issuing bank."
}
https://github.com/CyberSource/cybersource-rest-client-dotnet/blob/master/Model/PtsV2CreditsPost201Response.cs
does not implement ErrorInformation in the object model.