Advanced Collection Strategies

We have a requirement that the work items will be triggered per individual invoice. Currently, the work items are triggered based on the account scoring since when we are using below scoring components;

1.Delinquencies Amount for Account

2.Number of Delinquencies for Accounts

3.Customer Since for Account

Below are the sample work items;

1.Polite call 10 days after invoice has been sent

2.Soft call 7 days before invoice due date

3.Medium call 2 days after due date

4.Medium call 8 days after due date

5.Firm reminder 15 days after due date

Question: How can we trigger the collection strategy based on individual invoices transaction date and due date.