Dear

Thank you for your letter of (date) in which you
explained the circumstances behind your request for an
extension of time to remit your payment on invoice #

We do appreciate your straightforwardness and have noted
on your account that your payment will be made on (date)

You have been a loyal customer of ours for quite some time
and if this gesture on our part helps to ease your current
situation, we are pleased to be of assistance.