Dunning letter email customization

Summary:

Dear [Customer legal name], - Customer Account Description need to be used in.

Our records show our invoice(s) with a balance of [include ccy and amount] in your account are due for [***] days(**** ). We request your attention to settle the overdue amount of [ccy amount] to our bank account as soon as possible.

In case payment has already been made please forward us the remittance advice to finance@unfleet.org for us to be able to identify the amount.

Thank you.

Best regards,

XXXXXXX

How can we dynamically retrieve the above highlighted information when we send dunning letter to Customer.