How to add the Billing account details in Google Developer Account to increase requests hit daily limit?

Follow below mentioned steps to add Billing account details in Google Developer Account to increase requests hit daily limit:
Step 1 :  Go to Google Maps Platform
Step 2 :  Click on Get Started
Step 3 :  Tick mark Maps, Routes, and Places checkbox
Step 4 :  Click on Continue
Step 5 :  Click on Select or Create Project dropdown menu
Step 6 :   Select project “Demo”
Step 7 :  Click on Next
Step 8 :  Click on Create Billing Account
Step 9 :  Select country, and appropriate option in Acceptances. Now select Yes to agree to Terms & Conditions
Step 10 :  Click on Agree and Continue
Step 11 :  Enter your Tax Information details, and click on Start My Free Trial