# Revenue Rules

Revenue rules are instances of revenue rule models. These rules are associated with product rate plan charges. Rules help manage revenue recognition on subscription charges.

 - [GET /v1/revenue-recognition-rules/product-charges/{charge-key}](https://developer.zuora.com/v1-api-reference/older-api/revenue-rules/get_revenuerecrulebyproductrateplancharge.md): **Note:** This operation is only available if you have [Invoice Settlement](https://docs.zuora.com?resourceId=billing-invoice-settlement) enabled. The Invoice Settlement feature is generally available
 - [GET /v1/revenue-recognition-rules/subscription-charges/{charge-key}](https://developer.zuora.com/v1-api-reference/older-api/revenue-rules/get_revenuerecrules.md): Retrieves the revenue recognition rule associated with a subscription charge by specifying the charge ID. Request and response field descriptions and sample code are provided.
 - [GET /v1/settings/finance/revenue-automation-start-date](https://developer.zuora.com/v1-api-reference/older-api/revenue-rules/get_revenueautomationstartdate.md): Describes how to get the revenue automation start date. Request and response field descriptions and sample code are provided.