gistfile1.txt

$ curl -u $STRIPE_API_KEY: https://api.stripe.com/v1/customers -d plan=monthly
{
  "error": {
    "type": "invalid_request_error",
    "message": "This customer has no attached card"
  }
}
$ curl -u $STRIPE_API_KEY: https://api.stripe.com/v1/customers -d plan=monthly -d trial_end=1421427622
{
  "object": "customer",
  "created": 1421423593,
  "id": "cus_5WfkR4vvmYlpX2",
  "livemode": false,
  "description": null,
  "email": null,
  "delinquent": false,
  "metadata": {},
  "subscriptions": {
    "object": "list",
    "total_count": 1,
    "has_more": false,
    "url": "/v1/customers/cus_5WfkR4vvmYlpX2/subscriptions",
    "data": [
      {
        "id": "sub_5WfkZb34OPisx4",
        "plan": {
          "interval": "month",
          "name": "Monthly",
          "created": 1380491006,
          "amount": 10000,
          "currency": "usd",
          "id": "monthly",
          "object": "plan",
          "livemode": false,
          "interval_count": 1,
          "trial_period_days": null,
          "metadata": {},
          "statement_descriptor": null,
          "statement_description": null
        },
        "object": "subscription",
        "start": 1421423593,
        "status": "trialing",
        "customer": "cus_5WfkR4vvmYlpX2",
        "cancel_at_period_end": false,
        "current_period_start": 1421423593,
        "current_period_end": 1421427622,
        "ended_at": null,
        "trial_start": 1421423593,
        "trial_end": 1421427622,
        "canceled_at": null,
        "quantity": 1,
        "application_fee_percent": null,
        "discount": null,
        "tax_percent": null,
        "metadata": {}
      }
    ],
    "count": 1
  },
  "discount": null,
  "account_balance": 0,
  "currency": "usd",
  "cards": {
    "object": "list",
    "total_count": 0,
    "has_more": false,
    "url": "/v1/customers/cus_5WfkR4vvmYlpX2/cards",
    "data": [],
    "count": 0
  },
  "default_card": null,
  "subscription": {
    "id": "sub_5WfkZb34OPisx4",
    "plan": {
      "interval": "month",
      "name": "Monthly",
      "created": 1380491006,
      "amount": 10000,
      "currency": "usd",
      "id": "monthly",
      "object": "plan",
      "livemode": false,
      "interval_count": 1,
      "trial_period_days": null,
      "metadata": {},
      "statement_descriptor": null,
      "statement_description": null
    },
    "object": "subscription",
    "start": 1421423593,
    "status": "trialing",
    "customer": "cus_5WfkR4vvmYlpX2",
    "cancel_at_period_end": false,
    "current_period_start": 1421423593,
    "current_period_end": 1421427622,
    "ended_at": null,
    "trial_start": 1421423593,
    "trial_end": 1421427622,
    "canceled_at": null,
    "quantity": 1,
    "application_fee_percent": null,
    "discount": null,
    "tax_percent": null,
    "metadata": {}
  }
}