curl --request PATCH \
  --url https://api.paytsoftware.com/v1/tasks/{id}/unmark_completed \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/x-www-form-urlencoded' \
  --data 'administration_id=<string>' \
  --data 'fields={}'

{
  "assigned_to_user": {
    "id": "<string>",
    "name": "<string>",
    "email_address": "<string>"
  },
  "administration_id": "<string>",
  "credit_case_id": "<string>",
  "debtor_id": "<string>",
  "id": "<string>",
  "invoice_id": "<string>",
  "description": "<string>",
  "subject": "<string>",
  "expiry_date": "<string>",
  "completed_at": "2023-11-07T05:31:56Z",
  "updated_at": "2023-11-07T05:31:56Z",
  "created_at": "2023-11-07T05:31:56Z",
  "comments": [
    {
      "id": "<string>",
      "content": "<string>",
      "created_at": "2023-11-07T05:31:56Z"
    }
  ]
}