Allow for Discount Code to be available in the RunInput Query

[tthambinayagam]

We are trying to migrate over our Shopify Scripts to Functions and have solved most of our use cases except 1. Currently, if a customer enters a specific discount code at checkout our Script will not run. When the customer removes the discount code, the script is executed. Note that for some discount discount codes we do offer the ability to stack against our shopify discount function but specific discount codes need to be excluded and customers should be able to choose to use the function discount or the discount code.

We have read through all the documentation and looked at various threads and cannot seem to find a solution to this use case.