The PostGrid integration enables automatic delivery of paper invoices to customers. COS generates the PDF invoice and PostGrid handles printing and postal distribution.
Enabling the integration: Administrators control the PostGrid integration through a dedicated setting in the admin panel. This setting also determines whether the paper invoice option is visible to users in Marketplace or Prospector.
How it works:
- The default invoice method remains email. Paper and email invoicing can run simultaneously, or paper invoice can be used exclusively.
- Billing addresses are printed on invoices to support window envelope delivery.
- Payment is processed via Stripe or NMI, or recorded directly to the ISP's account as a cash transaction.
Optional paper invoice fee: A fee for paper invoicing can be configured in the back end. If enabled, the fee is automatically applied when paper invoice is selected for a customer and removed if deselected.
The Pingen integration enables sending physical letters to customers on demand. Unlike paper invoices, letters are not sent automatically — they are triggered explicitly, for example through a Send letter action.
Use cases: Pingen is suited for formal written communications that need to reach customers by post, such as:
- Installation preparation instructions
- Formal notices and regulatory communications
- Any scenario requiring a documented physical correspondence
Tip: Because letters are only sent when explicitly triggered, you have full control over when physical mail goes out — no risk of accidental automated sends.
General API
In addition to the PostGrid and Pingen integrations, COS provides a general API for physical mail, making it possible to connect other postal service providers. Contact your account manager or the COS support team for documentation and setup assistance.