Use settings page to customise the app for your specific requirements.
You can choose to process past orders via PaySync. Processing past orders helps you get the same seller protection and prevent you from chargebacks and fraud.
To process past orders, chose a cut off date, after which all orders will be processed. Once you submit the form, the past orders will be queued and processed in the next cycle. If any order is already processed, it will be skipped automatically.