curl --request PUT \
  --url https://api.virtuoussoftware.com/api/v2/Pledge/WriteOff/{pledgeId} \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "reason": "<string:required:maxLength=100>"
}
'

{
  "id": "<integer>",
  "contactId": "<integer>",
  "amountPledged": "<double>",
  "frequency": "<string>",
  "pledgeDate": "<dateTime>",
  "expectedFulfillmentDate": "<dateTime>",
  "createDateTimeUtc": "<dateTime>",
  "createdByUser": "<string>",
  "modifiedDateTimeUtc": "<dateTime>",
  "modifiedByUser": "<string>",
  "segmentId": "<integer>",
  "segment": "<string>",
  "projectId": "<integer>",
  "project": "<string>",
  "isPrivate": "<boolean>",
  "status": "<string>",
  "payments": [
    {
      "id": "<integer>",
      "expectedPaymentDate": "<dateTime>",
      "expectedAmount": "<double>",
      "giftId": "<integer>",
      "actualAmount": "<double>"
    },
    {
      "id": "<integer>",
      "expectedPaymentDate": "<dateTime>",
      "expectedAmount": "<double>",
      "giftId": "<integer>",
      "actualAmount": "<double>"
    }
  ],
  "customFields": [
    {
      "name": "<string>",
      "value": "<string>",
      "displayName": "<string>"
    },
    {
      "name": "<string>",
      "value": "<string>",
      "displayName": "<string>"
    }
  ]
}