Update Stripe's Customer Credit Card Information

Question

I finally figured out how to implement Stripes Monthly Billing using this tutorial.

So far, A User can Create & Delete their Subscription with Stripe. But I am having trouble calling the hashes inside the API to have the User change his credit card information.

Question: How do I call/pass the child parameters in the documentation to update the Credit Card Fields using the method I have created update_card?

This is my Code with Comments:

CONTROLLER

class SubscriptionsController < ApplicationController

  def update
    @subscription = current_user.subscription

    ### I use the method update_card to update the customer's card
    @subscription.update_card  

     if @subscription.update_card
      redirect_to edit_subscription_path, :success => 'Updated Card.' 
    else
      flash.alert = 'Unable to update card.'
      render :edit 
    end
  end

end

MODELS

class Subscription < ActiveRecord::Base
  attr_accessible :plan_id, :user_id, :email, :stripe_customer_token, :last_4_digits,
              :card_token, :card_name, :exp_month, :exp_year, :stripe_card_token

  attr_accessor :stripe_card_token

  belongs_to :plan
  belongs_to :user

  ### How can this work with my edit form. Would I need to store each person's new card?
  def token
    token = Stripe::Token.create(
       :card => {
       :number => "4242424242424242",
       :exp_month => 1,
       :exp_year => 2015,
       :cvc => "314"
      },
    )
  end

  def update_card
    customer = Stripe::Customer.retrieve(stripe_customer_token)
    customer.email = "myteam@gmail.com"
    customer.description = "Unlimited"
    customer.card = token.id
    customer.save
  rescue Stripe::StripeError => e 
    logger.error "Stripe Error: " + e.message 
    errors.add :base, "#{e.message}." 
    false
  end

Here is Stripe's Documentation Example Response

#<Stripe::Customer id=cus_3OWtLd5pirU4te 0x00000a> JSON: {
  "object": "customer",
  "created": 1390946171,
  "id": "cus_3OWtLd5pirU4te",
  "livemode": false,
  "description": "Customer for test@example.com",
  "email": null,
  "delinquent": false,
  "metadata": {
  },
  "subscription": null,
  "discount": null,
  "account_balance": 0,
  "currency": "usd",

  ###I need to be able to update the data inside the customers card
  "cards": {
    "object": "list",
    "count": 1,
    "url": "/v1/customers/cus_3OWtLd5pirU4te/cards",
    "data": [
      {
        "id": "card_103OWt2eZvKYlo2CgyXLaqcd",
        "object": "card",
        "last4": "4242",
        "type": "Visa",
        "exp_month": 9,
        "exp_year": 2015,
        "fingerprint": "Xt5EWLLDS7FJjR1c",
        "customer": "cus_3OWtLd5pirU4te",
        "country": "US",
        "name": "Brendan Lynch",
        "address_line1": null,
        "address_line2": null,
        "address_city": null,
        "address_state": null,
        "address_zip": null,
        "address_country": null,
        "cvc_check": "pass",
        "address_line1_check": null,
        "address_zip_check": null
      }
    ]
  },
  "default_card": "card_103OWt2eZvKYlo2CgyXLaqcd"
}

Reference: Stripe Documentation for Ruby

js.coffee

jQuery ->
  Stripe.setPublishableKey($('meta[name="stripe-key"]').attr('content'))
  subscription.setupForm()

subscription =
  setupForm: ->
    $('#new_subscription').submit ->
      $('input[type=submit]').attr('disabled', true)
      if $('#card_number').length
        subscription.processCard()
        false
      else
        true

  processCard: ->
    card =
      {number: $('#card_number').val(),
      cvc: $('#card_code').val(),
      expMonth: $('#card_month').val(),
      expYear: $('#card_year').val()}

    Stripe.createToken(card, subscription.handleStripeResponse)

  handleStripeResponse: (status, response) ->
    if status == 200
      $('#subscription_stripe_card_token').val(response.id)
      $('#new_subscription')[0].submit()
    else
      $('#stripe_error').text(response.error.message)
      $('input[type=submit]').attr('disabled', false)

LOGS

Started PUT "/subscriptions/5" for 127.0.0.1 at 2014-01-30 01:53:35 -0800
Processing by SubscriptionsController#update as HTML

  Parameters: {"utf8"=>"✓", "authenticity_token"=>"ehyUD17CbH7MMOe98s+Kqkh+wGghntWkG4OpoqbnQaA=", 
"subscription"=>{"plan_id"=>"1", "user_id"=>"1", "stripe_card_token"=>""}, 
"commit"=>"Update My Credit Card", "id"=>"5"}

User Load (1.0ms)  SELECT "users".* FROM "users" 
WHERE "users"."remember_token" = 'xEeu1X6IK9gUAsna9b6Mow' 
LIMIT 1
Subscription Load (0.5ms)  SELECT "subscriptions".* 
FROM "subscriptions" WHERE "subscriptions"."user_id" = 1 LIMIT 1

Stripe Error: You passed an empty string for 'card'. We assume empty values
are an attempt to unset a parameter; however 'card' cannot be unset. You 
should remove 'card' from your request or supply a non-empty value

Answer 1

either you can create a new card and delete the old one that will make the new card default_card for that customer or you can also achieve it by updating the customer and passing card details as mentioned here(check card field and its child parameters) https://stripe.com/docs/api#update_customer

Edit:

Do it like this

require "stripe"
Stripe.api_key = "sk_test_BQokikJOvBiI2HlWgH4olfQ2"

token = Stripe::Token.create(
   :card => {
   :number => "4242424242424242",
   :exp_month => 1,
   :exp_year => 2015,
   :cvc => "314"
   },
)
cu = Stripe::Customer.retrieve("cus_3Ok02kebTNsPDJ")
cu.card = token.id
cu.save