> For the complete documentation index, see [llms.txt](https://docs.peakcommerce.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.peakcommerce.com/product/getting-started/setup/1.-connect-your-billing-system.md).

# 1. Connect Your Billing System

PeakCommerce is built to run on top of your existing billing system — most often **Zuora** — as the source of truth for your plans, charges, and subscriptions. Connecting it is the foundation of setup: once linked, your **catalog syncs directly from billing**, so what you sell in PeakCommerce mirrors what you actually bill, without re-entering pricing by hand.

**What connecting gives you**

* **A synced catalog** — your plans and their charges flow into PeakCommerce, ready to sell.
* **Write-back** — commerce actions like checkout and subscription changes post to your billing system.
* **Alignment over time** — as your billing catalog changes, PeakCommerce stays in step.

**How to connect**

1. Open **Settings → Integrations**.
2. Choose your provider. PeakCommerce connects **Zuora**, **Stripe**, **Maxio**, and others — or any billing system.
3. Add a connection and enter its credentials.
4. Run an initial **catalog sync** so your plans appear under **Commerce → Product Catalog**.

**Who and when:** connecting a provider needs credentials from that system, so have them on hand — or bring the question to kickoff. Your Implementation Team can help with Zuora-specific configuration.

**Gotcha:** until a billing system is connected and synced, your catalog will show no plans. That's expected — the catalog is populated *from* billing, not entered by hand.

**Learn more:** see the **Integrations** documentation for provider-specific setup (including Zuora Billing), and [Billing & Catalog settings](/product/settings/billing-catalog.md) for sync and cache controls.

**Next step →** With billing connected, [Build Your Catalog](/product/getting-started/setup/2.-build-your-catalog.md).


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