# Notifications PAI sends automated email notifications to keep users and vendors informed as work moves through key workflows. All system notifications come from **[email protected]** — add this address to your safe senders list to ensure delivery. --- ## Email Notifications ### User Invitations When you invite a new workspace user, PAI sends them an email with a link to create their account. Invitation links expire after **48 hours** — if a user doesn't activate within that window, send a new invitation. ### Vendor Notifications **Vendor invitation** — when you invite a vendor to connect, they receive an email with instructions to register on the vendor portal. Existing PAI users see a connection request instead. **Expense posting** — when you post expense lines to a vendor, PAI sends them an email notification that they have expenses ready to invoice. This notification is delayed approximately **2–3 hours** after posting. **Invoice reminder** — if a vendor hasn't submitted a posted invoice, PAI sends a reminder every two days. **Invoice approved** — vendor receives confirmation when their invoice is approved. **Invoice changes requested** — vendor is notified when their invoice is rejected and changes are needed. **Payment date set** — vendor receives the scheduled payment date when it's assigned. **Payment complete** — vendor is notified when their invoice is marked as Paid. --- ## In-App Notifications PAI's in-app notification center alerts you to key events without requiring you to check each module. Events that trigger in-app notifications: **Vendor events** - Vendor record created - Vendor invited to connect - Vendor accepted the connection - Vendor declined the connection - Vendor began onboarding - Vendor completed onboarding **Project and campaign events** - Project created - Campaign created - Project approved - Project overage approved - Project reconciled - Project expense status updated - You were tagged in a comment **AP events** - Vendor invoice submitted - Vendor invoice approved