# How-to Guides

## Working with Bill Runs

**Standard Bill Runs:**

Use `GET /bill-runs` to retrieve information about billing cycles.

**Ad-hoc Billing:**

Use `POST /adhoc-bill-runs` to create ad-hoc bills for specific products or customers.

Use `PATCH /adhoc-bill-runs` to automate ad-hoc bill run processes.

Use `GET /adhoc-bill-runs` to retrieve ad-hoc bill run details, including `adhocProductInventoryIds` and `rentalProductInventoryIds` that were billed.