Need HELP to create InvoiceCreationPreEmail Hook for setting DUE DATES based on NET15

[Anto.EgoX]

Hi,

 

I am trying to create a InvoiceCreationPreEmail Hook only for ANNUAL / BIENNIAL / TRIENNIAL Billing Cycle Invoices to set a Due Date as per NET15 Payment model.

 

https://en.wikipedia.org/wiki/Net_D

 

As soon as an Invoice is created for Customers, this InvoiceCreationPreEmail should function as:

 

1) Check Invoice Items Billing Cycle

2) If Billing is MONTHLY / QUARTERLY / SEMI-ANNUALLY, then it should go with WHMCS Automatic System Configuration (for Invoicing and Payment) as defined.

3) If Billing is done ANNUALLY / BIENNIALLY / TRIENNIALLY, then it should set the DUE DATE as within 15 Days of the Invoice Date (NET15 Payment Model)

4) Send Bills to Customers with New DUE DATE.

 

Example:

 

Actual Renewal Date: 01/05/2017

Invoice Date (45 Days before Renewal Date): 17/03/2017 (NOTE: This can be defined in WHMCS Automatic Configuration)

Due Date (within 15 Days of the Invoice Date): 01/04/2017 (NOTE: Expecting InvoiceCreationPreEmail Hook to set this DUE DATE - NET15)

 

If a Product's Renewal Date is scheduled on 01/05/2017, then the WHMCS System is supposed to create its Invoice on 17/03/2017 (as defined in our WHMCS System - 45 Days before Renewal Date), and as soon as this Invoice is created, this HOOK is then expected to set its Due Date as 01/04/2017 (within 15 Days of the Invoice Date).

 

Can someone help me with this please?

 

Thanks in advance.

 

Anto