Push events to your own systems, share live documents with end-clients, sync invoices to your accounting platform, and follow the integrations currently in development.
Receive HMAC-signed JSON deliveries on your own endpoint when invoices are paid, quotations accepted, and 14 other event types.
Cursor-paginated REST endpoints for clients, projects, quotations, and invoices. Bearer-token auth, typed error codes.
Share a quotation with your client via a token-gated link. They accept or reject without signing up.
Trigger flows from Zeng Book events into Slack, Sheets, HubSpot, and 6,000+ other apps.
Connect Xero, then every invoice you mark paid in Zeng Book pushes automatically as an AR invoice with retention preserved.
Send invoice PDFs and quotation links via the WhatsApp Cloud API.
Mirror uploaded documents to a folder in your firm's Google Drive automatically.
Sync paid invoices and contacts to your QuickBooks Online workspace.
Build any integration on top of the REST API and HMAC-signed webhooks. The same primitives we use for Zapier are open for your own systems.