## Zoho Billing - Product, solutions, integrations, support, and resources Index Access the complete documentation index at: https://www.zoho.com/om/billing/llms.txt Use this file to discover all available documentation pages before proceeding. [Back](./) # How are coupons in Zoho Billing differentiated? Coupons in Zoho Billing are differentiated by their redemption type. ``` Redemption Type refers to the number of times a coupon can be applied to a particular subscription. ``` Coupons are of two redemption types. * **One Time** * **Forever** **One Time** One Time can be chosen as the redemption type when a coupon is to be applied only once for a subscription. In other words, a coupon of one time redemption type can be used only once. **Forever** Forever can be chosen as the redemption type when a coupon needs to be applied each time an invoice is raised for a subscription. If you no longer want to apply this coupon to a subscription, the coupon can be removed by selecting the subscription from the Overview section of the Customers tab. > **Note:** You can also manually enter a validity period for a coupon using the **Valid Upto** field.