Toss Payments | emulate

A stateful emulator for the Toss Payments REST API.

Included now:

Payment confirm / lookup (by paymentKey or orderId) / cancel (incl. partial)
Checkout page simulation (/checkout → /checkout/approve)
An /internal/payments helper to create a payment without the widget
PAYMENT_STATUS_CHANGED webhooks on confirm and cancel

Start

# From this repo (after `bun install && bun run build`)
bun packages/emulate/dist/index.js --service tosspayments

# Or from the published package
npx @pleaseai/emulate --service tosspayments

A single service starts on the base port (default 4000). Use -p <port> to change it. When started alongside other services, ports are assigned sequentially from the base port (tosspayments’ slot is 4002).

Auth

Payment API routes use HTTP Basic auth with the secret key as the username and an empty password — Authorization: Basic base64("<secret_key>:") (note the trailing colon). The checkout pages and /internal/payments helper need no auth.

# Build the header value for test_sk_example
echo -n 'test_sk_example:' | base64   # → dGVzdF9za19leGFtcGxlOg==

Flow

# 1. Create a payment (replaces the payment-widget step)
curl -X POST http://localhost:4000/internal/payments \
  -H "Content-Type: application/json" \
  -d '{"orderId":"order-1","orderName":"Test order","amount":11000}'
# → {"paymentKey":"<paymentKey>", ...}

# 2. Confirm it
curl -X POST http://localhost:4000/v1/payments/confirm \
  -H "Authorization: Basic $(echo -n 'test_sk_example:' | base64)" \
  -H "Content-Type: application/json" \
  -d '{"paymentKey":"<paymentKey>","orderId":"order-1","amount":11000}'

# 3. Look it up (by paymentKey or by orderId)
curl http://localhost:4000/v1/payments/<paymentKey> \
  -H "Authorization: Basic $(echo -n 'test_sk_example:' | base64)"
curl http://localhost:4000/v1/payments/orders/order-1 \
  -H "Authorization: Basic $(echo -n 'test_sk_example:' | base64)"

# 4. Cancel it (omit cancelAmount for a full cancel)
curl -X POST http://localhost:4000/v1/payments/<paymentKey>/cancel \
  -H "Authorization: Basic $(echo -n 'test_sk_example:' | base64)" \
  -H "Content-Type: application/json" \
  -d '{"cancelReason":"User requested","cancelAmount":11000}'

Confirm and cancel dispatch a PAYMENT_STATUS_CHANGED webhook to any configured webhook URLs.

Seed Config

Add a tosspayments: section to emulate.config.yaml (or pass --seed <file>):

tosspayments:
  merchants:
    - client_key: test_ck_example
      secret_key: test_sk_example