Hi Jinish
TMF636 has been retired a long time ago - it was split into account management TMF666 and bill management TMF678.
The bill management API is a read-only API that reflects the bill and all the charges for a billing account for a given billing cycle. It also allows generation of an out-of-cycle bill (bill-on-demand) which might be relevant for a final bill.
The charges (ACBR) on the bill are collected by the billing process and would include any rolled-up usage charges applicable to the billing period, as well as one-time (e.g. equipment damage, commitment penalty) relating to the customer termination, and recurring (e.g. rental).
Separately, we have the usage APIs that allow interrogation specifically of rated product usages, which may or may not have been billed.
Hope it helps
------------------------------
Jonathan Goldberg
Amdocs Management Limited
Any opinions and statements made by me on this forum are purely personal, and do not necessarily reflect the position of the TM Forum or my employer.
------------------------------