Manual E-bill 499.41

10. ISR subscription at PostFinance
The PostFinance ISR accounts receivable solution (orange inpayment
slip with reference number) is described in the “ISR Orange inpayment slip
with reference number in CHF and in Euro manual”. This document may
be downloaded from w ww.postfinance.ch/isr.
The most important details are summarized below.
10.1 ISR subscriber number
The ISR customer number comprises three numbers:
• ISR code (01 for ISR in CHF, 03 for ISR in Euro)
• Classification number
• Check digit
The check digit is calculated using the modulo 10 recursive method.
The corresponding ISR number must be transmitted in the XML file under
the “PaymentData” in the “ESRCustomerNr” field:
01-123456-1
The biller may use up to n ISR customer numbers for the e-bill service.
Bills can only be delivered to PostFinance if the valid ISR customer number(s)
is/are registered in the biller’s database.
5-digit ISR subscriber numbers can no longer be used for e-bill.
10.2 Reference number
The reference number is numerical and either 16 or 27 digits long.
It is defined by the biller and serves to identify the payment from the bill
recipient or payer.
The reference number must be transmitted in the XML file under the
“PaymentData” in the “ESRReferenceNr” field as follows:
123456789012345678901234567
10.3 Delivery of incoming payment data
The incoming payment data must be supplied according to the standard
ISR service procedure as described in the manual.
Manual E-bill Version October 2010 35/64