Here at On Call Central, we bill on a four-week cycle. By nature, this means that there will be one month of the year in which your practice is billed twice.
For example, you may be billed on March 1st and will be again on March 29th.
If you are the owner of your On Call Central account, you can update your payment method online at any time. Login to your account, click "Settings" in the top right, scroll down, then click "Billing." You can update your payment method immediately. Please see this video for an example of how to update your payment information.
If you have any other questions that are not answered by this article, please submit a ticket and we will be happy to help!