Login to the Shopify account.
Create a store in shopify.
Created a new app , by going in to settings >Apps and sales channels>Develop Apps.
Save the API key and Password in a file,
Get the Admin access token and save it in a secured file.
Go to the postman app or website and the create a new request and the mode is POST
Set Request details of the URL based on the following syntax.
https:/{API key}:{AccessToken}@{Store_name}/admin/api/{version}/customers.json.
and then press send.
The customer will be created.