- Developer: https://developer.paypal.com/
- Make sure your store has set the country to US and is using US dollars (for easier testing).
- Sign up for a PayPal account.
- Go to "My Apps & Credentials" and create a REST API apps.
- Use the information from step 4 information to fill in the settings: Sandbox API Username, Password, Signature.
- Remember that your buyer email and facilitator email are automatically generated and are available in Sandbox > Accounts. Likewise, the store email must match the facilitator email.