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? Mailing Address Toll Free 800-825-3641 Local 260-490-8328 Credit Card Mailing Address What is the cut off time for processing regular bill payments?