Add reminder fee to invoice

Create reminder invoice, with additional fee.

This module extends the invoice functionality with an additional button to create a reminder invoice. A reminder fee product is added to the new invoice. If the original invoice is paid the amount of the reminder invoice will be reduced to cover only the fee. If the reminder invoice is paid paid the rest of the payment can be allocated to the original invoice.

A system property called product.reminder.fee must be configured with the ID of your reminderfee product as it's value.

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