通过订单退款接口对已经支付的 order 对象进行退款。
注意:用户在使用订单时,可能会出现以下异常情况,你需要根据实际情况进行退款处理:
order 对象的 status 值为 canceled,paid 值为 true,amount_paid 等于 actual_amount。order 对象中的 amount_paid 大于 actual_amount。属性详见 退款。
{
  "id": "re_y1u944PmfnrTHyvnL0nD0iD1",
  "object": "refund",
  "order_no": "y1u944PmfnrTHyvnL0nD0iD1",
  "amount": 9,
  "created": 1409634160,
  "succeed": true,
  "status": "succeeded",
  "time_succeed": 1409634192,
  "description": "Refund Description",
  "failure_code": null,
  "failure_msg": null,
  "metadata": {},
  "charge": "ch_L8qn10mLmr1GS8e5OODmHaL4",
  "charge_order_no": "123456789",
  "transaction_no": "2004450349201512090096425284",
  "funding_source": null,
  "extra": {}
}