title: How can I fix this error in my Stripe integration?
body: <p>I'm having some trouble getting Stripe up and running in my Rails app. When I try to access my signup form in my local environment I get this error: </p>
  
  <p>undefined method `card_number'</p>
  
  <p>The corresponding code for my view is as follows:</p>
  
  <pre><code>&lt;%= f.label :card_number, "Credit Card Number" %&gt;
  &lt;%= f.text_field :card_number %&gt;
  </code></pre>
  
  <p>Because I'm getting an error for the card number, I also know that when I fix the error for the card number that I will get errors for the CVV code and card expiration date. I realize that I'm not supposed to save any credit card information to my database, so I don't have any information in my model with regard to credit card information. The only database migration that I have run was setting up a column in my users table for the stripe customer id token. </p>
  
  <p>Any help you can provide for me in getting Stripe up and working would be greatly appreciated!</p>