Creem

MuseMVP integrates Creem as one of its payment gateways, offering a payment solution for indie developers without a US entity. Through the unified Muse Billing module, it shares the same business logic and database tables as Stripe. This guide explains how to configure the Creem gateway and understand how it works.

Get the Creem API key

Retrieve your API key from the Creem Dashboard and set CREEM_API_KEY plus the Creem environment variables.

Creem

Key Security

Keep gateway secrets in env files or the platform secret store. Never expose them to the client or version control.

Get the Creem webhook secret

Creem

In the Creem Dashboard, create a Webhook and set the callback URL to:

https://example.com/api/muse-billing/notify/muse_creem

Select the event types to listen for (or all):

checkout.completed
subscription.active
subscription.canceled
subscription.updated

Creem

Set CREEM_WEBHOOK_SECRET to the signing secret from the Creem webhook.

Key Security

The webhook secret is a server-side environment variable. A mismatch with Creem will reject every webhook.

Create Products and Get Product IDs

Checkout product IDs are CREEM_PRODUCT_ID_PRO_MONTHLY, CREEM_PRODUCT_ID_PRO_YEARLY, and CREEM_PRODUCT_ID_LIFETIME. The public pricing UI uses stable app plan IDs.

Creem

After creating the corresponding products in the Creem Dashboard, paste the product IDs into the CREEM_PRODUCT_ID_* environment variables.

Local Development Testing

Download Ngrok

Ngrok (https://dashboard.ngrok.com/get-started/setup/windows) is a reverse proxy tool that exposes your local development server to the public internet.

Ngrok

Run

ngrok http 3000

Ngrok

Callback Domain

Use the terminal domain shown above as the callback URL in your Webhook configuration.

Switch to Sandbox Environment

Use Creem sandbox credentials in the env file and Creem test mode in the Dashboard.

Test Mode

Payments in the Creem sandbox environment do not result in real charges, making it safe for local testing of subscription and one-time purchase flows.

How It Works

Learn how Muse Billing integrates Creem into the system.

Integration Files

packages/billing/src/gateways/creem/gateway.ts

src/modules/muse-billing/lib/services/launch.ts

src/backend/api/routes/muse-billing/router.ts

File	Purpose
`creem/gateway.ts`	Creem gateway implementation: launch, Webhook parsing, contract sync.
`services/launch.ts`	Checkout orchestration; customer-hub.ts and webhook.ts own the other flows.
`router.ts`	API routes: exposes `/api/muse-billing/*` endpoints.

Core Workflow

The action flow for payment and accessing the Customer Hub:

Frontend calls POST /api/muse-billing/launch with productId, optional gatewayId (defaults to orchestrator selection), etc.

Server resolves the Creem product or price ID from CREEM_PRODUCT_ID_* environment variables.

Creem returns launchUrl and launchSessionId; frontend redirects to the Creem-hosted checkout page.

After payment, Creem sends a webhook; the server verifies the signature and syncs contract lifecycle and access window to the database.

When the user needs to access the platform portal, call POST /api/muse-billing/customer-hub to get a redirect link to the Creem Customer Portal for managing subscriptions or downloading receipts.

Stripe Payment Gateway — Alternative payment gateway
Dodo Payments Gateway — Alternative payment gateway
Waffo Pancake Gateway — Alternative payment gateway
Environment Variables — Gateway credentials and checkout product IDs
Basic Configuration — Pricing catalog and stable plan IDs

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