Delivery Date in Shopify Integration should default to Order Due Date

[MatthK]

Is your feature request related to a problem? Please describe.
When integrating Shopify with ERPNext, Sales Orders get created when an order is placed in Shopify. However, the delivery date shown in ERPNext is not the same as the Order Due Date in Shopify. Instead, ERPNext shows the order date as the delivery date.

Describe the solution you'd like
The Sales Order should use the Order Due Date from Shopify as the Delivery Date