* If there is a invoice and the balance is insufficient to pay. Then the user must pay off within 40 days after the invoice appears. If not make to pay then the account will be suspended. Suspend will be reopened after the invoice is paid. Then confirmed by sending an email for open suspension to email email@example.com (email with the subject "open suspend" and fill in the name of the publisher, prefix and PIC). Source : https://www.crossref.org/membership/terms/.
Annual Fee for Non Profit