If you have access to the project in GCPay, you can upload the waiver to the site by following these instructions: How do I upload a waiver?
If you've received a lien waiver with a cover sheet, it can be returned by email to docs@gcpay.com or by fax to 804-955-4176. Please leave the cover sheet in place. GCPay will use the QR code on the cover sheet to route the waiver back to the associated payment application.