> ## Documentation Index
> Fetch the complete documentation index at: https://docs.hanko.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Confirm transactions using Hanko Authenticator

> How to add a transaction detail to an authentication request so users can confirm it with the Hanko Authenticator app.

The process for confirming transactions with the Hanko Authenticator is essentially the same as for the regular [authentication](/hanko-authenticator/quickstart/authenticator-app-authentication) process.

The main difference between the two is that when *initializing* the request you need to supply a request body with an additional `transaction` attribute. Its value is a transaction text that is part of the request metadata displayed in the confirmation prompt during [out-of-band communication](/hanko-authenticator/quickstart/authenticator-app-authentication#step-2-confirm-the-authentication-request). It also becomes part of the challenge issued by the FIDO server and hence the signature created in the course of the authentication process.

<CodeGroup>
  ```bash cURL theme={null}
  curl -X POST "{API_URL}/v1/uaf/requests" \
  -H 'Authorization:secret pasteYourApiKeyHere' \
  -H 'Content-Type: application/json' \
  -d '{"operation": "AUTH", "username":"example@example.com", "userId":"exampleId", "transaction": "Transfer $100 to Mike?" }'
  ```

  ```bash HTTPie theme={null}
  http POST {API_URL}/v1/uaf/requests \
   'Authorization:secret pasteYourApiKeySecretHere' \
   'operation=AUTH' \
   'username=example@example.com' \
   'userId=exampleId' \
   'transaction=Transfer $100 to Mike?'
  ```
</CodeGroup>