fig1 is a block diagram of a system 5 for making payments on past due accounts and updating payment method information according to the present invention . system 5 includes a plurality of postage meters 10 . each postage meter 10 is rented by a customer from a provider and is used by the customer at a customer location . each postage meter 10 is in electronic communication , such as through a modem or the internet , with provider services server 15 . provider services server 15 comprises a server computer located at a location remote from each postage meter 10 that is operated by or under the direction of the postage meter provider . provider services server 15 is the main communications interface between the provider and postage meters 10 , and handles requests for various services from each postage meter 10 , including , without limitation , requests for refilling postage and requests for remote meter inspection . provider services server 15 is in electronic communication with postage refill server 20 , which is a server computer that includes a software system for tracking , managing and administering postage value refills for remotely located postage meters such as postage meters 10 . as described above , such remote postage value refilling systems are well known in the art and thus will not be described in detail herein . in addition , provider services computer 15 is in electronic communication with accounts receivable server 25 , which is a server computer that includes a system for tracking and managing customer accounts . a number of such systems are known in the art and are able to track the status of customer accounts , such as amounts due and / or past due for rental fees owed for postage meters 10 and any other products rented by the customer ( referred to as accounts receivable data ). provider services server 15 is thus able to access and receive accounts receivable data from accounts receivable server 25 for any particular customer having a postage meter 10 . in addition , through communications with postage refill server 20 , provider services server 15 is able to fulfill postage value refill requests for any particular postage meter 10 . fig2 is a flowchart depicting a method for making payments on past due customer accounts using the system shown in fig1 according to an aspect of the present invention . as seen at step 100 , the method begins with one of the postage meters 10 sending a message to provider services server 15 requesting a service such as a postage value refill or a remote inspection . next , at step 105 , a determination is made as to whether the customer associated with the postage meter 10 has a past due account . in particular , product services server 15 queries accounts receivable server 25 to obtain account information for the customer and determines whether the customer has a past due account . as will be appreciated , what exactly constitutes a past due account in each situation will be determined by the provider . for example , an account may be considered to be past due a predetermined number of days , such as thirty , following the issuance of an invoice . if the customer does not have a past due account , then , at step 110 , provider services server 15 facilitates the performance of the requested service . for example , if the requested service is a postage value refill , provider services server 15 communicates with postage refill server 20 and the postage meter 10 in order to fulfill the postage refill request according to the provider &# 39 ; s established procedure . if , however , the customer does have a past due account , then , at step 115 , provider services server 15 sends a message to postage meter 10 indicating that the requested services cannot be performed because the customer has a past due account . postage meter 10 includes a display , such as an lcd , that will present such a message to the customer for viewing . next , a determination is made as to whether the customer wants to make a payment for the past due account using postage meter 10 and a credit card . in particular , an appropriate message will be displayed to the customer , and the customer is able to make a choice by entering information using the keyboard or other input device provided on the postage meter 10 which is then transmitted to provider services server 15 . if the answer at step 120 as reflected by the received information is no , then , at step 125 , the requested services are denied and an appropriate message is transmitted to the postage meter 10 and displayed to the customer . preferably , the message includes a request for the customer to contact the provider to discuss the past due account . if , however , the answer at step 120 is yes , then , at step 130 , credit card information , including a card number and expiration date , is collected from the customer for purposes of making a payment for the past due account . specifically , the customer enters this information into the postage meter 10 , which then transmits it to provider services server 15 . alternatively , the customer may provide an indication that a credit card on file with the provider may be used for this purpose . next , the method returns to step 110 where the requested service , such as a postage value refill , is performed . note that the provider may decide what level of payment will be required to proceed to step 110 at this point . for example , the provider may require that the total past due amount be paid in full , or , alternatively , that only a percentage of the past due amount be paid . thus , this aspect of the invention provides an automated system and method for collecting payments on past due accounts that provides added convenience to both the customer and the provider . as a result , customers are able to get services in an immediate fashion , rather than having to wait to resolve a past due account by calling the provider , and providers are able to collect on past due accounts with less burden on their staffs . fig3 is a flowchart depicting a method for updating payment method information according to a further aspect of the present invention . the method begins at step 135 , where a postage meter 10 sends a request to refill or recharge postage meter 10 to provider services server 15 in which the customer wishes to pay for the postage refill using a credit card . in this situation , the provider has previously received and stored information for the particular credit card that the customer wishes to use as its default method of payment . this information , which includes the credit card number and expiration date is accessed by provider services server 15 . next , provider services server 15 attempts to make the appropriate charge to the customer &# 39 ; s credit card , and , at step 140 , a determination is made as to whether the attempted credit card transaction has been rejected by the issuer of the credit card . if the answer is no , then , at step 145 , provider services server 15 communicates with postage refill server 20 and the postage meter 10 in order to fulfill the postage refill request according to the provider &# 39 ; s established procedure . if , however , the answer at step 140 is no , meaning the credit card transaction has been rejected , then , at step 150 , the provider services server 15 determines whether the rejection was due to the customer &# 39 ; s credit card having expired . if so , then , at step 155 , a determination is made as to whether the customer wants to enter a new expiration date for the same credit card . in particular , in the preferred embodiment , a message to that effect is sent from provider services server 15 to the postage meter 10 where it is displayed to the customer . if the answer at step 155 is yes , then , at step 160 , the customer enters the new expiration date into the postage meter 10 using its keyboard or the like , and the information is transmitted to provider services server 15 , where it is used to update the customer &# 39 ; s records for future transactions . next , the method returns to step 140 where the steps are taken to determine whether the credit card transaction using the updated information is rejected . if the answer is no , steps are taken a step 145 to refill the postage meter 10 with the requested postage ( the customer credit card with the new expiration date will be charged ). if the answer is yes ( transaction rejected ), the method proceeds to step 150 and beyond . if during the course of the method the answer at either of step 150 or 155 is no , then , at step 165 , postage services server 15 determines whether the customer wishes to provide a new credit card with new information for use in the transaction . if the answer is no , then , at step 170 , the postage refill request is denied because there is no valid method of payment . if , however , the answer at step 165 is yes , the customer , at step 175 , enters the new credit card information into the postage meter 10 using its keyboard or the like and the information is transmitted to provider services server 15 , where it is used to update the customer &# 39 ; s records for future transactions . next , the method returns to step 140 , where it is determined whether the transaction using the new credit card information is rejected . if not , then , at step 145 , steps are taken to refill postage meter 10 . if the transaction is again rejected , the method again proceeds to steps 150 through 175 described above . thus , the system and method of this aspect of the invention enable a customer to provide new / updated payment method information for postage refills without having to separately telephone the provider . as will be appreciated , this system and method provide added convenience and efficiency for the customer and lessen the customer service burden on the provider . while preferred embodiments of the invention have been described and illustrated above , it should be understood that these are exemplary of the invention and are not to be considered as limiting . additions , deletions , substitutions , and other modifications can be made without departing from the spirit or scope of the present invention . accordingly , the invention is not to be considered as limited by the foregoing description but is only limited by the scope of the appended claims .