# Getting Started with Trading API

> Place, observe, and reconcile a sandbox trade with the MyStocks Partner API.

## Workflow

1. Authenticate with a sandbox partner key.
2. Create or select a verified sub-account, or use the master account.
3. Request a quote using the exact symbol, side, quantity, or `cashValue`.
4. Place the order with the returned `quoteId` and an `Idempotency-Key`.
5. Poll order status or subscribe to signed webhook/SSE events.
6. Inspect executions, portfolio, buying power, and ledger entries.
7. Reconcile the completed trade against the daily report.

The full request sequence is in [Trading](/partners/docs/trading), including market, limit, stop, time-in-force, cancellation, and fractional cash-value examples.

## Important invariants

- Never reuse an expired or already-consumed quote.
- Never generate a new idempotency key when retrying the same write.
- Treat webhook delivery as at-least-once and potentially out of order.
- Do not treat a submitted or pending order as settled custody.

Use the [API Tester](/partners/docs/api-tester) for individual calls and the [API Reference](/partners/docs/api-reference) for the exact request schema.