Open APIs

Hi everyone,

As part of ongoing work with TM Forum Open APIs, I'm exploring the recommended integration patterns between the Order Management and Billing domains – particularly for enabling invoice generation based on completed product orders.

Based on the specifications:

• TMF620 covers product ordering

• TMF622 provides access to active product inventory

I'm interested in best practices for enabling billing:

🔹 Should the Billing system consume data from Product Inventory (TMF622), or is it more common to interface directly from TMF620, or via an intermediate layer?
🔹 How do APIs like TMF666 (Billing Account) and TMF678 (Customer Bill Management) typically fit into this flow?
🔹 Are there reference flows or implementation examples that illustrate this transition from order capture to billing?

Appreciate any insights or experiences from the community.

Thanks!

Hi Haris, have a look to TMF 637 Product Inventory Management , there are multiples discussion around this subject in the communities discussions