How to get a Domain key 

Step 1: Signup at
After sign in, you will get this screen, click on Continue as individual

Step 2: Register your organization

Click on the Work tab at the top right corner.

Click Create New Organization from left navigation bar

Note: if you are not an organization, you can register with your project name. 

Fill the organization details. Let's take an example of indeed where users go to search for jobs. Here indeed’s designated employee will register the organization. 

Step 3: Register your domain

Click on organization name (i.e. indeed) on top left corner. 

Click on Domain on left navigation bar

Click on Add new Domain which is at top right side. 

Fill the form and create a Domain.

After domain creation, View Domain button will appear at top right corner. Click on that button to get the domain key.

This is how you will get a Domain Key which you will be using in your Projects.