code: def repay_loan(self, order_id, amount, _async=False):
          
          params = {'order-id': order_id, 'amount': amount}
          path = f'/v1/margin/orders/{order_id}/repay'
          return api_key_post(params, path, _async=_async)
docs: 归还借贷
          :param order_id:
          :param amount:
          :return: