The Otto Marketplace Connector for Business Central is a build-to-order AL extension that ECOSIRE designs, develops, installs and supports directly on your Dynamics 365 Business Central environment. This is not an instant AppSource download — it is a per-tenant extension scoped to your catalog, your German tax setup, your number series and your fulfilment workflow, then deployed by us and maintained over time.

Otto Market (otto.de) is one of Germany's largest marketplaces, but it has no native bridge to Business Central. Without integration, sellers re-key Otto orders by hand, let stock drift between BC and Otto, and miss shipment SLAs. This connector closes that gap using BC's own primitives: AL table and page extensions, event subscribers, a dedicated permission set, and Job Queue entries that poll and push on a schedule.

On the inbound side, the extension authenticates to the Otto Market Selling Partner API, pulls new orders, maps SKUs to BC items, and creates real sales orders (or sales invoices) with the correct customer template, VAT posting group and currency. On the outbound side it publishes and updates product listings with German (DE) category and attribute mapping, keeps available inventory and price in sync from BC item/availability data, writes shipment and tracking numbers back to Otto when you post a warehouse shipment, and processes returns and refunds against the original order.

ECOSIRE handles the full lifecycle: discovery of your catalog and tax rules, AL development, sandbox validation against your data, production install as a per-tenant extension, Job Queue configuration, and post-go-live support. You own a clean, upgrade-aware extension — not a brittle spreadsheet macro or a black-box middleware subscription.