gistfile1.txt

 def make_purchase(user) 
     if valid?
        amount = (DO YOUR CONVERSION STUFF HERE)
	cu = Stripe::Customer.retrieve(user.stripe_customer_token)
	cu.card = stripe_card_token # obtained with Stripe.js
	cu.save
        customer = Stripe::Charge.create(customer: user.stripe_customer_token, description: user.email, amount: 500, currency: 'usd')
	save!
     end 
  end