How do I initiate a (partial) refund?

Detailed information on “Refunds” can be found in the respective manual at: https://www.sofort.com/integrationCenter-eng-DE/content/view/full/3363

If you only need to make a refund occasionally, we recommend you to do it manually using your online banking. For the account data of your customer, please refer to your statement of account or the transaction details in the merchant menu (menu item “SOFORT Banking transactions”).