At this time, is is not yet possible to fully test recurring payments using the SEPA Direct Debit payment method. It is, however, possible to generate direct debit payments, but their status will remain on 'pending', which also means we won't provide feedback via the webhook. In order to test the whole process, you can use the payment method credit card and the Test API key. When a recurring payment via credit card is generated, we will call the webhook a few minutes later. If all that works, it will also work with recurring payments via SEPA Direct Debit in the live mode.