Hotels running ERPNext for their property management still juggle their OTA channels by hand. Someone logs into the Booking.com extranet, then Expedia Partner Central, then the Airbnb host dashboard, and re-keys availability and rates three times a day. The moment a walk-in or a phone booking lands in ERPNext, the OTAs are stale — and two guests get sold the last Deluxe King for the same night. ERPNext core has no concept of a channel manager: there is no two-way OTA connector, no rate-plan-to-channel mapping, no stop-sell propagation, and no reservation inbox that pulls external bookings back into your Reservation and Sales Invoice flow. You either pay a separate SaaS channel manager that doesn't know your ERPNext data, or you keep re-typing numbers and eating the overbooking penalties.

ECOSIRE builds a proper Frappe app installed into your own ERPNext bench that closes this gap. We model channels, rate plans, and restrictions as first-class DocTypes (OTA Channel, Channel Rate Plan, Rate Restriction, Channel Booking), and wire a two-way sync layer: outbound pushes of availability and rate changes to each connected OTA, and inbound pulls of new, modified, and cancelled reservations. Availability recalculation is driven by hooks.py doc events — when a Reservation or room block is created, updated, or cancelled, a doc_event handler recomputes free inventory per room type and enqueues a channel push via Frappe's background workers, so parity is event-driven rather than a slow nightly batch. A scheduler_events cron acts as a safety-net reconciler, reconciling counts every few minutes and flagging drift. Overbooking and stop-sell guards run server-side: when net availability for a room type hits your configured threshold, the app pushes a stop-sell (availability 0) to every channel at once instead of letting the last room sell three times.

Inbound OTA reservations are ingested through whitelisted methods and, where the OTA supports it, webhooks, then normalised into Channel Booking records and auto-created as ERPNext reservations with the guest, dates, room type, rate and channel commission captured — so your front desk sees one centralised reservation inbox instead of three extranets. Rate-plan and restriction mapping is explicit per channel: your internal rate plans map to each OTA's rate-plan IDs, and min-stay, CTA/CTD and closed-to-arrival restrictions are stored and pushed per channel. OTA credentials are held in an encrypted Channel Credential DocType, access is gated by a dedicated role profile and DocType permissions so only front-office and revenue roles can touch rates, and every push and pull is written to a sync-log DocType for auditability and retry. Client scripts add the front-desk conveniences — a live parity panel, a "re-sync now" action, and inline validation on rate-plan mapping.

Because this is build-to-order, we do not hand you a generic download. After a short scoping call we confirm which OTAs you connect (Booking.com, Expedia, Airbnb, or others), how your room types and rate plans map, and your overbooking policy, then build against your ERPNext version (v15 or v16). Typical delivery is one working week from confirmed scope. You get the installable app source for your version, installed and configured on your bench, UAT on a staging site before anything touches production, a rollback plan, training for your revenue and front-office team, and a post-go-live support window. The git repository is handed over to you so the code is yours to keep and extend.