How to fetch all data from Subscription Management

Summary:

I want to fetch all data from Subcription Management to Oracle CPQ

Content (please ensure you mask any confidential information):

Hello all,

I was wondering if can fetch all data from Subcription Management to Oracle CPQ for a specific customer (may be using Customer ID ) using one API.
Upon getting the repsponse, I will parse the Json and use them in CPQ.

Currently, we use root asset key to fetch which is a performance issue as it iterarates over Line Item Grid.

Alternative ideas are welcome, which can be useful to make the perofrmance of the site better

Version (include the version you are using, if applicable):