Read this documentation to prepare your environment https://docs.microsoft.com/en-us/power-bi/developer/embedding-content

To embed reports, dashboards and tiles, the following details must be specified within web.config:

For security reasons, in a real application, the user and password should not be saved in web.config. Instead, consider securing credentials with an application such as KeyVault.

Follow these steps to run PowerBI.com Integrate samples:

Register an application to be used to call Power BI APIs using the Embed Setup Tool

Redirect URL - http://localhost:13526/Redirect

Home Page URL - http://localhost:13526/

Registration Example:

Copy Client Id and Client secret to Cloud.config file

To resolve a 'CS0012:Predefined type 'System.Object' is not defined or imported' error, please update web.config.

Find line:

<compilation debug="true" targetFramework="4.5"/>

And modify it to:

<compilation debug="true" targetFramework="4.5">
 <assemblies>     
   <add assembly="System.Runtime, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" />   
 </assemblies>
</compilation>

Power BI Support Page

Power BI Ideas

Contains several API calls samples for App Owns Data.

After registering an app (as described under "App Owns Data Sample").

Fill config parameters under config.json.

Use one of the methods in app-owns-data-sample.js to make the coresponding api call.