Inside of Microsoft Dynamics 365 Business Central, go to the customer record and pull up the iSolutions Collections window under actions.
Select one or more invoices
On the Collections form below, you can select multiple past due invoices to email. Once you have selected the invoices to be emailed, simply click on the email button highlighted.
If you have multiple contacts, you can select which contact to send the past due invoices to. Once you have select the contact, hit the Send Email button.
Click to Pay
Your customer will receive their past due invoices with a click to pay link at the bottom.