Magento 2 Auto Invoice & Shipment - Cynoinfotech
https://www.cynoinfotech.com/product/auto-invoice-and-shipment-magento-2-extension/
The Magento 2 Auto Invoice and Shipment extension takes care of creating invoices and shipments, sending invoices and shipment emails. By not having the admin perform these tasks programmatically or manually, the overall process time is reduced which enhances the user experience of your store. Magento 2 Auto Invoice and Shipment is a set of powerful tools that allow you to automatically create invoices and shipments of orders once your orders are completed.