MPC processes all Client credit cards on a monthly cycle within the first week of the month.
If your credit card is rejected for some reason (e.g., expired card, credit limit exceeded), MPC will send the primary administrator an email notice. At that point your access to MPC functionality will be limited to fixing the credit card issue.
To fix the issue, logon to MPC and navigate to the UPDATE PAYMENT INFORMATION screen in the SETUP Menu. From this screen you can enter new credit card information and authorize MPC to run the credit card to make any overdue payment (the amount overdue will be displayed on this screen).