curl --request POST \
  --url https://api.example.com/api/v1/accounts/{accountId}/projects/{projectId}/widgets/{widgetId}/configurations/{widgetConfigurationId}/deltas \
  --header 'Content-Type: application/json' \
  --data '
{
  "delta": [
    {}
  ],
  "sequenceNumber": 123,
  "fullConfiguration": {}
}
'

{
  "id": "<string>",
  "accountId": "<string>",
  "baseWidgetConfigurationId": "<string>",
  "creatorId": "<string>",
  "delta": {},
  "createdAt": "<string>",
  "sequenceNumber": 123,
  "fullConfiguration": {}
}