Because data items to be describe on the invoice have been saved as the approval information in the Workflow, all you have to do is to insert them into the template of PDF.
By the way, here we are going to make the framework of Invoice Issuance flow.
Of course in the future, we aim to connect to 'Delivery flow' or 'Service Providing flow' which goes to issue invoices, but now, to begin with, we are going to visualize "Invoice issuance situation".
[Invoice Issuance flow]