1. An electronic version of the publication (*.pdf, no scanned documents)
2. Original invoice (*.pdf) of the publisher. Please note that a clear link must be
established between the invoice and the article, e.g., via the persistent identifier or the
title on the invoice.
3. Proof of payment in euros (*.pdf)
(a) Credit card statement and/or copy of bank transfer: the IBAN of the credit card or bank account must be shown in full, and
(b) an SAP expense list including stamp and signature of the bursar’s or finance office of the research institution.
In both cases, a clear link between the invoice and the proof of payment must be evident.
Bank charges, taxes, and exchange rate gains and losses can be considered, but they must be clearly identified in the application and the amounts must be clearly attributable and evidenced by an accounting document.