I need to convert my modules from 1.9.X to 2.0.X,
Is there any way to convert, or we will start from scratch.?
Although, I have not tried it before, but there are some scripts available which claim that they can convert Magento 1.x modules to Magento 2.x modules.
Below are some reference links:
Since folder structure and coding pattern are totally different between Magento 1.x and Magento 2.x, one can not use Magento 1.x modules directly into Magento 2.x, but there is an official code migration tool which can help the developers to migrate theirs modules and design themes:
But the tools is for experienced developers only.
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I would enquire with FedEx before putting much effort into rewriting code. They may have something available for Magento2.