With managed package 1.73, "Subskribe Order Type" is now a mandatory field on opportunities. Sales reps can set the appropriate value for this field (New/Amendment/Renewal/Cancel) while creating the opportunity. Subsequently, when sales reps create Subskribe orders from their Salesforce Opportunities, the system seamlessly takes them to the New, Amendment, Renewal, or Cancel order forms on Subskribe.
Please note that Subskribe’s existing customers upgrading to 1.73 will need to manually configure "Subskribe Order Type" as mandatory and set the default value of this field to "None."