You can create paypal account to follow below steps.
Create New App
To create a REST API app:
- Log in to https://developer.paypal.com and click the Applications tab.
- On the My Apps page, click Create App
3.On the Create New App page, provide an app name.
4.Click Create App, and then review the information displayed about your app
Sandbox Tab
Live Tab
You must put in the data obtained to the following screen.