# Start the extraction fields request

> :::tip
The Project ID is obtained from the response received from the [Get project information](https://docs.uipath.com/document-understanding/automation-cloud/latest/api-guide/use-the-discovery-service) call.
:::

## Start extracting fields from a document

:::tip
The Project ID is obtained from the response received from the [Get project information](https://docs.uipath.com/document-understanding/automation-cloud/latest/api-guide/use-the-discovery-service) call.
:::

```
curl -X 'POST' \
  '{AutomationCloudURL}/<Organization_Name>/<Tenant_Name>/du_/api/framework/projects/<Project_ID>/extractors/invoices/extraction/start?api-version=1' \
  -H 'accept: text/plain' \
  -H 'Authorization: Bearer eyJhbGciOiJSUzI1NiIsImtpZCI6IkY5QTYwNUMxRDlFOEQyNzFGNTZBOEE4NzI2NTgzMURBRjkyMkQ5ODAiLCJ4NXQiOiItYVlGd2RubzBuSDFhb3FISmxneDJ2a2kyWUEiLCJ0eXAiOiJKV1QifQ.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.ij6SIKi1aT3TrsSP3JVzOomhyESKVgSd4KQlU_PyRBI3gaLbtS3CIM0tmIuaXpKhwrIpTjPbXRLzF0nzu7u7YX7ICTmMO3hL_Ym3EXB9rGDJSlHyiunwEq-6RMyOq3I7naKEQv5ZOHK9lksgH3OWRN8CmsBynuJR59WBjDbkd8tVwiHdkfYS4EJ2FsDM6f4otIpJ4DJ0xqf95eVF7b4H1VciSNJ2pYeeRcfCwumcNdwwQ1LqDqadFIGiunUHUqSn9PYirMUKlzSP4Bo6llTeGJcwLq65SveiC0tt2fzomYLJ2jGYB465rKfy7jx8Rx4vQBcU9a8esnKLiPHM52jsOg' \
  -H 'Content-Type: application/json' \
  -d '{
  "documentId": "381a05a2-14ed-ee11-aaf0-002248996ede",
  "boostExtractionConfidence": 70
}'
```

:::note
The `boostExtractionConfidence` parameter is used to boost the extraction confidence when extracting Document Data with APIs. Only field values with confidence below this threshold will be verified against the generative model, and if the values match, their confidence score is boosted.
:::

## Response of extracting fields from a document

```
{ "operationId": "eee0a911-dfe8-ed11-907c-6045bd9d17d0" }
```