- Connect to the PayPal Developer Website
- Click on Applications on the horizontal bar
- And then on Sandbox Accounts on the left menu
- Click on the arrow next your Sandbox business account email address,
- and then click on the Profile link that appears below the email address.
This opens the Sandbox account details window.
- In the window Account details, from the Profile tab of this window, select Upgrade to Pro. Then click the Enable button.
- Click on Close. Your Sandbox Business Account has been upgraded