Sage 300

We require an experienced Sage 300 developer to: Analyze and consolidate two existing Sage 300 custom API packages (available only as ZIP files, source code not available) into a single package. Ensure all existing API functionality is retained and compatible with the target Sage 300 version. Develop a new OE Shipment Invoice API similar to the standard OEInvoices API. The API should expose shipment invoice header and line details, including customer, invoice number, shipment date, item details, quantities, pricing, taxes, and totals. Support filtering by shipment invoice number, customer number, and date range. Provide deployment documentation and testing support. Strong experience with Sage 300 SDK, Sage 300 Web API customization, C#, .NET, and SQL Server is required.