Invoice of -$37.50
 
The -$37.50 is a credit for the free trial for the first $15K billed ($15K x 0.25% = $37.50). The amount carries over every month. We invoice monthly, users can find out more about our billing cycle here:
https://mdbilling.ca/ontario/mdbilling-autopay-faq-ohip/

The trial period ends when you consume your credit of $37.50 (ie. bill more than $15K). Once we have a charge pending after your free trial, we will request your credit card information.

For more billing tips, please check out our "Weekly Tip Library" at 
https://support.mdbilling.ca/hc/en-us/sections/201726993-Weekly-Tip-Library

Questions? Check under the HELP tab or send an email to support@mdbilling.ca

Thank you,
MDBilling.ca Ltd.