To use Google Maps for address auto-fill, a Google Maps connection must be created using a Google API key. Below, we will explore how to create the connection and obtain the API key from Google.

Steps to Create a Google Maps connection

1. Click the icon on the left in the forms listing page to access the Control Panel.
   
   
   
   
2. Click Google Maps Connections under Developer Space.
   
   
   
   
3. Click Add New Connection.
   
   
   
   
4. Enter a Connection Name.
   
   
   
   
5. Provide the Google Maps API Key - Client value.
   This key will be used to access Google Maps for auto-filling the Address field in the web app. 
   
   

6. Provide the Google Maps API Key - Mobile value.
   This key will be used to access Google Maps for auto-filling the Address field in the mobile app.
   Learn More about creating an API key
   

   Notes:
   

   1. If the Google Maps API key - Mobile is left empty, the API key provided for the client (web app), will be re-used for mobile app.
   2. For the auto-fill to work in the web app, Places API and Maps JavaScript API should be enabled in Google API Library. Learn More
      
   3. For the auto-fill to work in the mobile app, Places API and Geocoding API should be enabled in Google API Library. Learn More

7. Accept the terms and conditions and privacy policy of Google, then click Create to proceed.
   
   Once created, connections can be viewed later by navigating to Control Panel > Google Maps Connections. Options to edit and delete the connection are available. Additionally, the usage details can be viewed by clicking the  icon.
   
   

Setting up a Google API Key

For address auto-fill via Google Maps to work, as described in the above section, a Google Maps connection must be created. This requires a Google API key. 

Below are the prerequisites for creating an API Key:

1. Create a Google Cloud Project.
   
2. Create a Google Cloud Billing Account.
   
3. Link the Billing Account with your existing Project to enable billing.
   
4. Enable the required Google APIs for auto-fill to work by navigating to Google Maps Platform > APIs & Services.
   
   For the auto-fill to work in the web app, enable the Places API and Maps JavaScript API, then provide the Google Maps API Key – Client value in the Google Maps Connection after creating the key. Learn More

      For the auto-fill to work in the Mobile app, enable the Places API and Geocoding API, and then provide the Google Maps API Key – Mobile value in the Google Maps Connection after creating the       key. Learn More

Note:  If you have an existing Google Cloud Project and Google Cloud Billing Account, you need not create a new one. You can simply link them and proceed. 

Creating an API Key

1. Go to the Google Cloud Console.
2. In the top-left corner, click APIs & Services.
   
3. Click Credentials from the available options.
   
   
4. Click the + Create Credentials button at the top.
   
5. Choose API key from the list of options.
   
   
6. Copy the created API Key as shown in the image below.
   
   

Application restrictions defines which websites, IP addresses, or apps can use the API key. If you want to prevent unauthorized access outside of Zoho Forms, you should configure these restrictions accordingly.

API restrictions determine which APIs can be accessed using the API key.If you want to limit access to specific APIs, you must configure these settings.

To configure the restrictions:

1. Click the Edit API key link in the popup shown in the previous image. Alternatively, navigate to Google Cloud Console > APIs & Services, click Credentials,
   and click the API key you just created.
   
   
   
   
2. Under Application restrictions, select Websites (HTTP referrers) and add the websites to restrict the key usage. 
   
   

   Add the domains based on your region. As you have added forms.zoho.com above for the US region, you can add forms.zoho.eu for the EU region, forms.zoho.in for the India region, and other domains as applicable. Custom domains, such as forms.zylker.com, can also be added if needed, as shown above. 

   Note : It is not recommended to set any Application restrictions & API restrictions on the API key used in the Mobile app for the address auto-fill.  
   
3. Under API restrictions, click Restrict key and then select APIs you want to restrict.
   
   

   
   For auto-fill address to work in the Web app, only Places API and Maps Javascript API are required.  Hence, we may limit the API usage to the same.  

   Note : Only the APIs enabled for the project will be listed here. To check the list of enabled APIs, navigate to the Google Maps Platform > APIs & Services. Learn More 
   
4. Click Save.