Stripe:如何在给定信用卡信息的情况下创建客户对象

let tok = await stripe.tokens.create({
    card: {
     number: '4242424242424242',
    exp_month: 12,
    exp_year: 2020,
    cvc: '123'
  }
})

tok 允许我一次性收费。接下来我想为以后的收费创建一个客户令牌,API是

  const customer = await stripe.customers.create({
    source: 'tok_mastercard',
    email: 'paying.user@example.com',
  });

然而,我不清楚我应该投入什么 source ,假设 是形式的

const tok = {
  "id": "tok_1DHGtNDubJ4bIrUdqXvAGo4m",
  "object": "token",
  "card": {
    "id": "card_1DHGtNDubJ4bIrUd2OyUHWNw",
    "object": "card",
    "address_city": null,
    "address_country": null,
    "address_line1": null,
    "address_line1_check": null,
    "address_line2": null,
    "address_state": null,
    "address_zip": null,
    "address_zip_check": null,
    "brand": "Visa",
    "country": "US",
    "cvc_check": null,
    "dynamic_last4": null,
    "exp_month": 8,
    "exp_year": 2019,
    "fingerprint": "rhpDLcuYn3stjjKR",
    "funding": "credit",
    "last4": "4242",
    "metadata": {},
    "name": "Jenny Rosen",
    "tokenization_method": null
  },
  "client_ip": null,
  "created": 1538598261,
  "livemode": false,
  "type": "card",
  "used": false
}

来源 tok.id 或 tok.card.id 托克 完全?