1.) In your web browser, navigate to https://developer.paypal.com and register for a sandbox account.
3.) In order to simulate licensing transactions, you'll need to set up 3 test accounts on the paypal developer sandbox. You'll need a buyer account to simulate your software's customers, a seller account to simulate yourself, and finally, a nitrolm account to simulate paying NitroLM fees.
a.) Create the buyer account.
4.) Make a note of the API Credentials for the nitrolm test account.