You'll receive a PDF invoice via email from MSC. On this invoice, you can find the Invoice Number and Client Number in the top right corner. You'll need these numbers to fill out the online bill pay form.
Additionally, if you need a W9 from MSC, we conveniently attach it to the end of every PDF invoice.
If you need support, please reach out to our team using the form on this page: https://www.costsegs.com/client-portal.