Step 1: Create an Access Token
Go To Settings > API Access & generate an API Key (Access Token)

Step 2: Use Postman to Test API
Download Postman for your operating system, and open Postman.

Enter following informations-

Method: GET
On the Authorization tab, select Bearer Token & enter API key
Click the Send button

It will look like this-

You will get JSON response for customer lists.
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