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For obtaining API Key, Auth Domain and Database URL follow below mention steps:
For New User
Step 1 : Go to Firebase.com
	Step 2 : If you have a Firebase account, Sign in, else create an account
	Step 3 : Click on Get Started 
	Step 4 : Click on Create a Project
	Step 5 : Enter Project name and tick mark the checkbox to accept Firebase terms.
	Step 6 : Click on Continue
	Step 7 : Select "Set up Google Analytics for my project" and click on Continue
	Step 8 : Open Configure Google Analytics dropdown menu and tick mark the checkbox to accept both the terms and conditions.
	Step 9 : Click on Create Project
	Step 10 : Click on Continue
	
	Step 11 : Click on Add Firebase to your web app 
Step 12 : Enter App nickname
	
Step 13 : Click on Register app
	
Step 14 : Here is your apiKey, authDomain and databaseURL. Copy appropriate keys and paste them in My Apps >> Editor >> Messenger>> Enter apiKey, authDomain and databaseURL section and click on Continue to Console
	
	 Step 15 : Click on Database
	Step 16 : In Real time Database , Click on Create database .
	Step 17 : Click on Enable 
	Step 18 : Click on Rules 
	Step 19 : Delete the entire code 
Step 20 : Now enter the following code, and click on Publish
	
	 Step 21 : Click on Storage from left menu.
Step 21 : Click on Storage from left menu. Step 22 : click on Get Started
Step 22 : click on Get Started
	Step 23 : Click on Next
	Step 24 : Click on Done
	Step 25 : Switch to Rules tab Step 26 : Add "|| request.auth == null" at the last in to the code
Step 26 : Add "|| request.auth == null" at the last in to the code Step 27 : The code(same as into below image), then click on Publish button
Step 27 : The code(same as into below image), then click on Publish button
For Existing user :
Step 1 : Go to Firebase.com
	Step 2 : If you have a Firebase account, Sign in, else create an account
	Step 3 : Click on Get Started 
	Step 4 : Click on Add Project
	Step 5 : Enter Project name
	Step 6 : Click on Continue
	Step 7 : Select "Set up Google Analytics for my project" and click on Continue
	Step 8 : Open Configure Google Analytics dropdown menu
	Step 9 : Choose your Google Analytics account or create a new account, and click on Create Project
	Step 10 : Click on Continue
	
	Step 11 : Click on Add Firebase to your web app 
Step 12 : Enter App nickname
	
Step 13 : Click on Register app
	
Step 14 : Here is your apiKey, authDomain and databaseURL. Copy appropriate keys and paste them in My Apps >> Editor >> Messenger>> Enter apiKey, authDomain and databaseURL section and click on Continue to Console
	
	 Step 15 : Click on Database
	Step 16 : In Real time Database , Click on Create database .
	Step 17 : Click on Enable 
	Step 18 : Click on Rules 
	Step 19 : Delete the entire code 
Step 20 : Now enter the following code, and click on Publish
	
	 Step 21 : Click on Storage from left menu.
Step 21 : Click on Storage from left menu. Step 22 : click on Get Started
Step 22 : click on Get Started
	Step 23 : Click on Next
	Step 24 : Click on done
	Step 25 : Switch to Rules tab Step 26 : Add "|| request.auth == null" at the last in to the code
Step 26 : Add "|| request.auth == null" at the last in to the code Step 27 : The code(same as into below image), then click on Publish button
Step 27 : The code(same as into below image), then click on Publish button
