You can test the insertion of a Transaction record and the Master record from the Chargent Settings tab.
- Click on the App Launcher in the top left side of Salesforce
- Click on Chargent App
- Click on Chargent Settings
- Click on Troubleshooting Tools
- Press the button to insert a transaction
The testing of the insertion is based on your setup in your Salesforce Org and will tell you if there are any Flows, Processes, or Validation Rules preventing it from saving a record.