Dear Felix
Your account with [name of firm] has been approved for credit. We would like to inform you that your account number is [account number]. 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.
Regard
Lydia