# Problem In the [README of CustomersDot](https://gitlab.com/gitlab-org/customers-gitlab-com/-/blob/staging/README.md#database), Zuora is mentioned as the source of truth for many important business object like Subscriptions. We can't call Zuora the [Single Source of Truth (SSOT)](https://about.gitlab.com/handbook/handbook-usage/#single-source-of-truth) at this point because there are is some duplication for key pieces of information. At best, we consider it the [System of Record (SOR)](https://about.gitlab.com/handbook/handbook-usage/#system-of-record). For example, the `Order` model contains quite a bit of duplication from Zuora. Here are some resources that elaboration on this data duplication: - [Spreadsheet of fields that have some overlap between CustomersDot, LicenseDot, and Zuora](https://docs.google.com/spreadsheets/d/1TSeaQlMG8zopRqR_0ZcX0IKLN3IpIb3AY-36m6p6pc4/edit#gid=0) - [Domain model for CustomersDot and LicenseDot containing color-coded overlap information](https://gitlab.com/gitlab-org/customers-gitlab-com/-/blob/b9cc596e89911a7df37664cc3cfd30690a9f99b5/doc/architecture/index.md#database-structure-of-customersdot-and-licensedot) As a result of this data duplication, we've identified some data integrity issues which are outlined in [a separate epic](https://gitlab.com/groups/gitlab-org/-/epics/4307). In an effort to address some of the problems in the billing and licensing workflows a cross-functional working group was formed. The working group recommended exploring ways to reduce duplication between these systems in order to reduce the data integrity issues. # Proposal As part of the working group, a [Zuora SSOT discussion paper](https://docs.google.com/document/d/1ayKH7rSKTCzjZojd15YFRk-T18xt-aznSNR-R4pFXnM/edit?ts=5f7ee2ac#) was formed to identify how Zuora is currently used, define the desired usage of Zuora as a SSOT going forward, and list pros/cons of that desired state. This epic includes issues to reduce the data duplication in CustomerDot with Zuora and move us closer to calling Zuora the SSOT.