Hi Sakthipriya,

Welcome to the Box Community!

As a developer, to request authorization for an application:

1. Open your Developer Console.


2. Go to My Apps and click the application you want to authorize or enable.


3. Depending on the custom app type, go to Authorization tab for server authentication applications or Enablement for user authentication applications.
   
   IMPORTANT: The Enablement tab is visible only if a Box Admin enabled the Disable unpublished apps by default setting.
   
   


4. Click Review and Submit. 


5. Review the app details.
   
   • If you are working in a sandbox environment, use the Publish Location section to select whether to publish in the parent enterprise or in the same sandbox.
   
   
   • If you are using a production instance of the parent enterprise, you will not see the Publish Location section because the app is automatically published in the production environment.
   
   


6. Wait for a Box Admin to approve your application. When this happens, you will receive an email with the details.

Reference: https://support.box.com/hc/en-us/articles/360043697014-Authorizing-Custom-Applications-in-Sandbox-and-Production-Environments 

I trust this information is helpful. Thank you for posting!