To create your application's API key:

1. Go to the API Console.
2. From the projects list, select a project or create a new one.
3. If the APIs & services page isn't already open, open the left side menu and select APIs & services.
4. On the left, choose Credentials.
5. Click Create credentials and then select API key

To enable billing for your project:

1. Go to the API Console.
2. From the projects list, select a project or create a new one.
3. Open the console left side menu and select Billing  
4. Click Enable billing. (If billing is already enabled then this option isn't available.)
5. If you don't have a billing account, create one.
6. Select your location, Select Google Maps Support in Dropdown and fill out the rest of the form. Make sure the price is displayed in $Dollar and click Submit and enable billing.

In the browser, Google has a certain limit on connections per month which keeps revising so you can see the latest pricing at https://cloud.google.com/maps-platform/pricing (ex. $2 per month for 1000 map requests on non android platform i.e. web and iOS and free upto $200 per month or 1,00,000 requests per month or 50,000 employees sign in/ out for 25 days)
To create an account it will take credit card details and debit a test amount which will be refunded.

Inside API Section, Type ‘Places API‘ in the search area. Select the ‘Places API‘ from search results and click the ‘ENABLE‘ button

Inside API Section, Type ‘Geocoding API‘ in the search area. Select the ‘Geocoding API‘ from search results and click the ‘ENABLE‘ button

Need to allow location access to capture the location of Google browser.