Moodle Web services - Secure ???

by Nilesh Pathade.  

Hi all,

I am trying to integration my external application which is developed into Java and Angular technology with Moodle.

Moodle has process to create web service token,  

Site adminstration => Plugins => Web Service => Manage token

Enabled all required setting for moodle web services.  Add new web service. 

My Question is that IF WEB SERVICE TOKEN LOST THEN ANYONE CAN ACCESS MY WEB SERVICES.

How to validated my token is coming from valid domain ??? 

OR 
How to call my external API to check valid request before calling any Moodle web service / API

Please correct me 

Thank you