How to Connect Firebase with your Web eClassify
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Create firebase project in your account     
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Add web application to your firebase project  
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Enter the App Name and Click on Register App  
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Now Copy this Firebase Credentials.  
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How to configure domain in firebase console  
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And paste this your Credentials in .env and public/firebase-messaging-sw.js File.   
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Open firebase account go to project settings -> cloud messaging -> Web configuration and select key and paste in .env file   
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Congratulations. You have successfully connected your Web application to your firebase project. Now you are good to go ahead.