High-ticket and made-to-order merchants have a cash-flow problem that stock Odoo eCommerce does not solve: it forces a binary choice at checkout. A customer either pays the full amount up front — which kills conversion on a $4,000 custom sofa or a bespoke machine build — or you take the order offline into email and spreadsheets and lose the audit trail. Odoo's native "down payment" exists only inside the backend Sales flow (sale.advance.payment.inv), where a salesperson manually creates a down-payment invoice line after the quotation is confirmed. There is no self-service deposit on the website /shop checkout, no rules engine to vary the deposit by product or category, and nothing that chases the remaining balance automatically.

This is what we build. The module adds a deposit stage to the payment.transaction and website checkout flow so the storefront can charge, say, 30% now and record the rest as a balance due. We introduce a configurable rules model (models.Model with fields.Selection for percentage-vs-fixed, fields.Float for the amount, and @api.depends computes that resolve the effective deposit for a given cart line). Rules are matched per product.template, per product.category, or globally, with a documented precedence order, and the resolved figures are shown to the shopper before they pay. On payment, the order confirms with the deposit captured and the balance tracked on the sale.order, so nothing leaves the ERP.

Technically, the balance lifecycle is handled with Odoo's own accounting objects rather than a bolt-on ledger. When the deposit is captured we generate the deposit invoice; the remaining balance is exposed through a tokenised, signed public pay-link (built on Odoo's /my portal and payment-token mechanics) that the customer can settle with the same payment provider they used originally — Stripe, Adyen, Razorpay, a Middle-East gateway, or manual bank transfer — because we hook the standard payment.provider interface rather than any single acquirer. A scheduled action (ir.cron) drives a reminder cadence for outstanding balances, sending QWeb-templated emails at the intervals you define, and an automated action can flag or escalate orders whose balance is overdue. Every new model ships with ir.model.access.csv entries and record rules so portal users only ever see their own balance, and all balance and pay-link state is reachable over XML-RPC/JSON-RPC for your other systems.

Because this is a build-to-order product, you are not downloading a fixed binary and hoping it fits. We start from a short scoping call, confirm your deposit policy, payment providers, tax treatment and target Odoo version (17.0, 18.0 or 19.0; Community or Enterprise), and only then build against your exact environment. Typical delivery is one working week from confirmed scope. You receive the installable source, install and configuration on your instance, UAT on a staging database with a rollback plan, documentation, a training session, and a post-go-live support window — plus the git repository so the code is unambiguously yours.