No problem. You can keep your existing Accredited Platform (PA).
The invoicing mandate granted to Folkyn simply allows Folkyn to issue invoices in your name and on your behalf for assignments managed through Folkyn. For these invoices, you therefore do not need to create or send them through your own PA.
Folkyn relies on Super PDP to issue and transmit these invoices under the 19a mechanism.
You can continue to use your usual PA for your other clients and invoices that are not managed through Folkyn.
The goal is to avoid duplicate work: for an assignment managed through Folkyn and covered by the mandate, the approved timesheet triggers the invoicing process, with no need to enter the same information again in your own PA.