Subscriptions

The kit splits payments by platform:

Implementation

1. Pick the provider(s) your app needs: RevenueCat for mobile, Stripe for web, or both.

2. Turn it on in kasy new (while creating the project) or later with:

   kasy add revenuecat      # turns on mobile subscriptions
   kasy add stripe          # turns on web subscriptions
   kasy add --list          # shows what's on
   kasy remove revenuecat   # removes it
   kasy remove stripe       # removes it

   Via MCP: "add RevenueCat/Stripe to the project" (add_feature), "remove X" (remove_feature), "what's on?" (list_features). See Kasy MCP.

3. Follow the full guide for the provider you picked:

   RevenueCat guide

   Test Store, Sandbox, production, paywalls, and webhook.

   Stripe guide

   Product, prices, webhook, and Stripe's MCP.

Information

Golden rule

The subscription is written on the server via webhook. The client never writes "I'm premium." It can't be faked. The paywall's plans are fetched automatically from the provider: you never type a price into the code.

Last updated on 08/02/2026