I have scheduled a pick up for a parcel, will JP Post print the shipping label when they collect?

I have filled the form out online and scheduled the international EMS package pick up. But everything was in Japanese and Google translate can only do so much.

I received an email telling me I need to go to a post office and show them the email to receive an invoice? Is this necessary? Will the person sent to collect the parcel be able to print out the invoice/label and can I pay by card when they come to pick up?

Thanks for any help!!