In general it would be nice if ITFLow could generate direct debit sepa xml files if the customers has agreed to pay his invoices with direct debit (independent of any stripe setup which costs money).
So we have a ITFlow > invoices dashboard/site where we see the due invoices - a "Generate SEPA xml file" button there could generate a sepa xml file which has all due invoices in there (from clients which agreed to sepa direct debit payments).
In europe every online banking plattform has a way to upload such generated sepa.xml files to send it to the bank.
A good library for generating sepa xml files (in php) is php-sepa-xml/php-sepa-xml for example.