Hi. I have several hundred invoices that were sent as one-time invoices. I now want to update all of them to be recurring invoices so a new invoice is automatically sent to each customer on an annual basis. My questions are:
1) How do I edit an invoice that's already been sent (and paid) so that it becomes a recurring invoice?
2) Is there a way to do #1 in bulk?
BTW, using the PayPal API is acceptable if this is the only way to do it.