查询订单剩余可出境余额

电商收付通中，针对多次请求出境的场景，商家需要查询可出境金额之后再进行出境请求其中：订单剩余可出境金额=订单可出境金额-已累计出境金额 官方文档

wxpay.v3.fundsToOversea.transactions._transaction_id_.available_abroad_amounts.get({
  transaction_id,
  params,
})
.then(
  ({ 
    data: {
      transaction_id,
      available_abroad_amount,
    },
  }) => ({
    transaction_id,
    available_abroad_amount,
  })
)