# Upland Users Authentication
{% hint style="info" %}
To continue you must have a developer account registered and an application.
{% endhint %}
The developer will provide Upland User a connection code to log in to your application. This code will be generated by the endpoint /auth/otp/init. The request must include basic authentication in the header call.
Basic access authentication is a method to provide a username and password when making a request. In basic HTTP authentication, a request contains a header field in the form of (Authorization: Basic \[credential]), where credentials are the Base64 encoding of ID and password joined by a single colon: For our case, you must consider the Username as the app ID and the password is the secret key(the provided when you created your application).
Postman basic auth example
After you generate the code, you must display/text/email this code to the Upland user trying to connect with your application.
They will take the code and include it in their account to validate the connection with your application.
When the connection was finished with success the developer will receive via webhook the Upland User Access token to access information about him.
```json
{
"type": "AuthenticationSuccess",
"data": {
"code": "B3FOHFBXEO",
"userId": "ab374e80-d765-11ec-b21b-07f133e9e7e9",
"accessToken":"eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c"
}
}
```
---
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