If WhatsApp is where your customers actually place orders, ERPNext leaves a gap. Native ERPNext POS is a fast in-store checkout, and Sales Order/Sales Invoice model the transaction cleanly, but there is no built-in bridge to a WhatsApp Business number: no way to turn an inbound chat into a POS order, no automatic digital receipt over WhatsApp, and no ready-for-pickup or reservation reminder driven by document state. Teams end up re-keying chat orders into POS by hand, screenshotting receipts, and chasing no-shows — errors, delays and lost repeat business that grow with every order.

ECOSIRE builds a proper Frappe app that closes that gap end to end. We add a WhatsApp Ordering Settings single DocType for your WhatsApp Business Cloud API (or approved BSP) credentials, message-template mapping and business-hours rules, plus WhatsApp Message Log and WhatsApp Order Inbox DocTypes so every inbound and outbound message is auditable inside ERPNext. Inbound messages arrive on a whitelisted webhook endpoint (@frappe.whitelist(allow_guest=True)) with HMAC signature verification; a catalog/order parser maps chat selections to Item records and drafts a Sales Order or POS Sales Invoice, so staff confirm rather than retype. Outbound messaging is driven by hooks.py doc_events — on Sales Invoice submit we render and send the digital receipt (with the print format PDF attached), and on status transitions we fire ready-for-pickup and out-for-delivery updates.

The build reuses ERPNext primitives instead of shadowing them. Reservations and bookings ride on ERPNext Appointment/Event (or a lightweight Table Reservation DocType when needed), and a scheduler_events cron sends timed reminders and re-confirmations without anyone watching the clock. Loyalty and promo broadcasts are segmented off Customer and Loyalty Program data and dispatched via approved WhatsApp template messages through the background queue (frappe.enqueue) with per-number rate limiting and opt-out handling, so you stay inside WhatsApp policy. Client Scripts add a "Send on WhatsApp" action to POS and Sales documents, whitelisted methods expose send/status endpoints to the Frappe REST API, and Role Profiles plus DocType permissions keep messaging scoped to cashiers, floor managers and marketing separately.

Because this is build-to-order, nothing here is a generic download you configure alone. After a short scoping call we confirm exact flows, message templates and the WhatsApp number/BSP you use, then build against your target ERPNext version — full support for Frappe/ERPNext v15 and the v16 line. You get the installable app source for your version, installation and configuration on your bench, a UAT pass on staging with a rollback plan, and a git repository handover. Typical delivery is one working week from confirmed scope.