Display payment fees on the PDF

Payment fees are deliberately not shown on the invoice for several reasons:

• The customer can pay the invoice with different payment providers with different fees. However, the PDF must remain static.

• The customer can start the payment with one provider, cancel it and start it again with another provider.

When the invoice is posted, the difference (i.e. the additional fees) is then posted as "Nebenkosten des Geldverkehrs" in your book keeping.