Sandbox Order Creation

When creating an order via the API, isSandbox defaults to 0, which means a normal order. Pass isSandbox=1 to create a sandbox order. Sandbox order features:

• Uses a fake/simulated payment process and does not deduct real balance
• No real logistics or fulfillment will be generated
• Order query APIs will return the isSandbox field to identify the order type
• Sandbox simulate pay and sandbox update status APIs only support orders created with isSandbox=1