I have a somewhat related problem today.
I am using (WA_eCart_TotalColumn(eCart1, "TotalPrice") in a custom shipping rule. However, this value is Pre-Discount so it is not giving me the actual value I need.
I need Taxable Total so that I can base my shipping on the total paid, after discounts.
I have tried (WA_eCart_TotalColumn(eCart1, "GetTaxable Total") but I get:
Microsoft VBScript runtime error '800a01b6'
Object doesn't support this property or method: 'cartObj.Items(...).WA_eCart_GetTaxableTotal'
What is the correct value to request for this?