Hi, In our current store (PS 1.7.6.7), we have a custom OnePageCheckout module working alongside the “Advanced Multi-Vendor Marketplace” and “Order Split” modules by Webkul. The customized OnePageCheckout allows selecting different carriers depending on whether the cart contains products sold by different vendors (Marketplace). In such cases, it splits the order into multiple separate orders (Order Split), one for each vendor. We are upgrading the store to PS 8.2.3 and need to customize the new version of OnePageCheckout so that it works the same way in the new store, with the latest versions of the Marketplace and Order Split modules. Access to the previous versions of the OnePageCheckout module (both original and customized) is available, so the customization can be reviewed and replicated accordingly.