Customers are unable to make credit card payments on the ProQuest Invoice Portal or on the OASIS site.

To request to pay an OASIS/Coutts invoice using a credit card please contact our Finance Department using the following methods:
1. Send an email request to
2. Call  1-800-521-0600 ext. 74150 (Accounts Receivable)
3. Send a fax request to our secure Fax Line: 734-531-2763