Dear

Your account with [name of firm] has been
approved for credit. We would like to inform you that
your account number is Please inform your
personnel to be sure to include this account number on
any documents and correspondence directed to
[name of firm]

We welcome you to our family of customers and hope that
our new relationship will be mutually beneficial and
profitable.

As our way of saying thank you for opening your new
account with us, we are offering you a [specify] discount
on all merchandise ordered in the month of [month]

If you have any questions regarding our credit policy,
please call [name] , our Credit Manager, who will
be more than happy to discuss your account with you.

We will be looking forward to your orders and to the
opportunity of serving you.

Try Google Search to find what you are looking for!

Here is some random sample letters.