Invoicing instructions

To ensure efficient operation and timely payment, Helsinki Region Environmental Services Authority HSY receives invoices primarily as e-invoices. If you do not have the possibility to send e-invoices, you can send your invoices in PDF format by email to hsy.ostolaskut@pdf.basware.com 

Please note the following instructions when sending PDF invoices: 

  • One PDF file may only contain one invoice and the related attachments. 
    Attachments must not be sent as separate PDF files. 
  • The name of the PDF file must not contain the letters ä, ö or å or special characters. 
  • Payment reminders can also be sent as PDF files to the address in question. 

Online invoicing address
OVT ID 0037227424191
Business ID 2274241–9 (EU format: FI22742419)
Intermediary operator Basware Oyj
Intermediator ID BAWCFI22

Invoicing address
Helsinki Region Environmental Services Authority
Purchase Invoices
PO Box 303
FI-00066 HSY

Things to note with the invoices

  • Invoicing address: Helsinki Region Environmental Services Authority HSY / Purchase Invoices PO Box 303, FI-00066 HSY 
  • Subscriber reference: e-mail address in the format firstname.lastname@hsy.fi
  • Term of payment: according to the agreement
  • Purchase order number: 13 characters in the format OT25HSY000045 
  • Payment plan reference: a unique identifier provided by the customer, such as RY2152289 
  • The attachments are primarily sent with the invoice. If the attachments cannot be delivered with the invoice, they must be sent in PDF format by email to ostolaskut@hsy.fi. The e-mail message must indicate to which invoice the attachments in question belong. 

Please note that invoices sent to the wrong address and invoices with incomplete information will be returned to the sender to be corrected. We are not responsible for the costs arising from the delay of the invoice’s payment if the invoice details are incomplete. 

Please send materials not related to the invoice, such as offers and bulletins, to ostolaskut@hsy.fi. 

For more information on the electronic processing of our purchase invoices, please send us an email to the same address. 

HSY-botti