How do I pay a 3Rivers loan/credit card/mortgage/line of credit? Log in and select the “Transfers” tab. Select the accounts you wish to pay from and pay to in order to initiate the payment. Have more questions? Submit a request 0 Comments Article is closed for comments. Related articles Where do I send Mastercard credit card payments? Toll Free 800-825-3641 Local 260-490-8328 Mailing Address What number do I call if I have a question or problem with my online bill payer? What is the cut off time for processing regular bill payments?