From paper dockets to
same-day invoicing.
Digiwah built Climat Trade Centre a custom Zoho Creator delivery app: proof-of-delivery captured on the phone, status pushed straight into Unleashed, and the invoice issued automatically through Xero. Live, in daily production.
Climat Trade Centre
A Victorian HVAC trade supplier of Daikin ducted reverse-cycle systems, Brivis gas heaters, wall splits, controllers, and solar & battery, sold at trade prices to installers across the state.
“We hold the stock. Always ready when you need it.”
But holding the stock means moving it. A delivery fleet runs orders out to trade customers every day, and that fleet ran entirely on paper.
The delivery that couldn't invoice itself
Every delivery created a paper docket. The invoice couldn't go out until that docket was physically chased back to the office and keyed in by hand. Cash flow waited on paper.
“ The #1 pain was simple: invoicing was delayed because of paperwork. Alroy Augustus, owner, Climat Trade Centre
One app, wired into the tools
they already trusted.
A custom delivery app on Zoho Creator sits between the systems Climat already ran. Unleashed creates the jobs. Climat dispatches and captures proof of delivery. Unleashed fires the invoice through Xero. Nothing was ripped out. We closed the gap in the middle.
From flagged order to issued invoice
Press play in your head, or just watch. This is the exact path every delivery now takes, in production.
Everything live & verified, grouped by who uses it
- Jobs auto-created from Unleashed, zero manual entry
- Drag-and-drop dispatch board
- Day & week views for advance route planning
- Click-to-detail cards: customer, SO#, phone, items, map
- Inline address editing from the board
- Ad-hoc internal jobs (not synced to Unleashed)
- Live KPIs: Open / Unassigned / Assigned / In transit
- Private, invite-only, sees only their own jobs
- One-tap Google Maps navigation
- Photo proof of delivery
- Customer signature capture
- GPS location stamped at the point of delivery
- Partial-delivery quantity logic, per line
- Auto Delivered date/time + “Signed By”
- Bi-directional Unleashed sync, in and out
- HMAC-SHA256 authenticated API calls
- Invoice-safety: only full deliveries flagged Ready
- Xero invoicing handled automatically downstream
- Webhook receiver with replay + idempotency protection
The architecture
Four layers, one job: get a signed delivery to become an invoice without anyone re-typing it.
HMAC auth, by hand, from Deluge
We signed Unleashed's REST API directly from Deluge, using HMAC-SHA256 over the query string. A first-time implementation, working in production.
Webhook security, re-thought
Creator hides headers and re-serialises bodies, so signature checks were impossible. We pivoted to shared-secret URL auth + timestamp replay protection + unique-constraint idempotency.
A board that never glitches
Optimistic UI with revert-on-error, local-authoritative state to survive replica lag, delete-reconcile, 15-second polling. “Stays smooth” was a hard client constraint. Met.
Full-payload sync pattern
Unleashed has no partial-update and no attachment API, so we used a GET-mutate-PUT pattern and referenced POD photos as URLs inside the order's comments.
What changed
Still running part of your business on paper?
We design the operation, build the system, and stay till your team owns it. Let's find the gap that's quietly costing you cash flow, and close it.