Teams that bill the same customers on a repeating cadence — retainers, service agreements, maintenance contracts, memberships, equipment leases — usually end up managing invoices by hand or with a spreadsheet reminder. Odoo core gives you subscriptions only in the Enterprise edition, and even there the object model is a subscription plan, not a negotiated commercial contract with signed terms, escalation clauses, tiered price lines, and per-contract billing rules. On Community you have no recurring-billing engine at all beyond manually duplicating invoices. The result is missed billing runs, revenue that leaks when a cadence is forgotten, and finance chasing which contract a given invoice actually belongs to. This is exactly the gap where Odoo native runs out of road for contract-driven recurring revenue.

ECOSIRE builds a dedicated sale.contract model (technical naming finalized during scoping to avoid clashes) that links to res.partner, one or more product/service lines, a billing frequency (monthly, quarterly, annual, or a custom interval), a start date, an optional end date or auto-renew flag, and the invoicing policy that governs it. A scheduled automated action — an ir.cron job running a Python method — walks active contracts each day, computes the next_invoice_date via @api.depends compute fields, and generates the corresponding account.move (customer invoice) draft or posts it, according to the rule you choose per contract. Each generated invoice carries an origin/reference back to its contract so finance can trace revenue end to end, and contract state (draft, running, paused, closed) is enforced so a paused agreement never bills. We wire access control through ir.model.access.csv plus record rules so, for example, a sales user sees only their own contracts while accounting sees all, and we ship QWeb report templates for a printable contract document and a billing schedule.

Because it is built as a proper Odoo module — its own __manifest__.py, models, security, views (list/form/kanban in XML, with OWL components only where an interactive widget genuinely helps), and QWeb reports — it upgrades cleanly and integrates with the standard Accounting and Sales apps rather than bolting on beside them. Generated invoices are ordinary account.move records, so tax computation, multi-currency, payment terms, follow-ups, and your fiscal localization all keep working. Where you need external systems to create or read contracts, we expose the model over Odoo's XML-RPC/JSON-RPC API so a CRM, e-signature tool, or provisioning system can drive billing programmatically. The build targets your exact edition and version, and we account for Community-vs-Enterprise differences (for instance, whether we lean on native subscription primitives on Enterprise or implement the full recurrence engine on Community).

Delivery is build-to-order: nothing is downloaded and switched on today. After a short scoping call we confirm the contract fields, billing rules, invoice-posting policy, and any integrations you need, then hand back a fixed quote and timeline. Typical delivery is 2–4 weeks from confirmed scope, ending with UAT on a staging copy of your database, a rollback plan, production install, documentation, and training. Pricing starts from $249 (indicative, single-company base scope); multi-company billing, deeper fiscal-localization requirements, extra integrations (e-signature, CRM, payment automation), and migration of existing contracts and open recurring schedules increase the quoted scope.