The below takes 10-20 minutes:
Salesforce Trial Organization
Blackthorn | Donations will not work with a Salesforce Trial Organization. You'll know if you're on a Trial if in the top right of the screen it says 'xx Days Remaining'. If you would like to test our application, please install into a Developer Org.
Navigate to the Blackthorn | Donations Setup Wizard Tab
Select "Allow" to Authorize Blackthorn | Connected App
Select " Make Magic Happen"
Note: If you installed Blackthorn | Donations into a developer org and are having issues with testing, please reference our Troubleshooting Documentation with Sandbox Testing