Send a direct debit request

Sends a direct debit request to an account holder's bank account. If the direct debit is successful, the funds are settled in the accounts specified in the split instructions. Adyen sends the result of the direct debit in a [`DIRECT_DEBIT_INITIATED`](https://docs.adyen.com/api-explorer/#/NotificationService/latest/post/DIRECT_DEBIT_INITIATED) notification webhook. To learn more about direct debits, see [Top up accounts](https://docs.adyen.com/marketplaces-and-platforms/classic/top-up-accoun...