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POCan't get PayPal Encrypted Website Payments to work in Rails
 

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  1. POCan't get PayPal Encrypted Website Payments to work in Rails
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    <p>I am having problems getting PayPal Encrypted Website payments to work on a Rails site.</p> <p>I am getting two different error messages when posting to the PayPal URL - on my staging site, which uses the sandbox, I am getting:</p> <blockquote> <p>The certificate has been removed. Please use a valid certificate.</p> </blockquote> <p>Whereas on the production site, I get:</p> <blockquote> <p>We were unable to decrypt the certificate id.</p> </blockquote> <p>As far as I can tell they are set up identically, except that one uses the PayPal Sandbox public key, and the other uses the normal PayPal public key. I must be overlooking some detail but I have banging my head against this for a couple of days now.</p> <p>I used the following commands to generate public and private keys:</p> <pre><code>openssl genrsa -out app_key.pem 1024 openssl req -new -key app_key.pem -x509 -days 365 -out app_cert.pem </code></pre> <p>Then I uploaded <code>app_cert.pem</code> to PayPal and put my cert ID into a file like this:</p> <pre><code>development: user: seller_1259814545_biz@somedomain.com action_url: https://www.sandbox.paypal.com/cgi-bin/webscr paypal_cert_file: certs/paypal_sandbox_cert.pem app_cert_file: certs/app_cert.pem app_key_file: certs/app_key.pem cert_id: CBDFN7JXBM2ZQ secret: dfasdkjh3453 test: user: seller_1259814545_biz@somedomain.com action_url: https://www.sandbox.paypal.com/cgi-bin/webscr paypal_cert_file: certs/paypal_sandbox_cert.pem app_cert_file: certs/app_cert.pem app_key_file: certs/app_key.pem cert_id: CBDFN7JXBM2ZQ secret: dfasdkjh3453 staging: user: seller_1259814545_biz@somedomain.com action_url: https://www.sandbox.paypal.com/cgi-bin/webscr paypal_cert_file: certs/paypal_sandbox_cert.pem app_cert_file: certs/app_cert.pem app_key_file: certs/app_key.pem cert_id: CBDFN7JXBM2ZQ secret: dfasdkjh3453 production: user: business@somedomain.com action_url: https://www.paypal.com/cgi-bin/webscr paypal_cert_file: certs/paypal_cert.pem app_cert_file: certs/app_cert.pem app_key_file: certs/app_key.pem cert_id: QG2TTZZM9DUH6 secret: dfasdkjh3453 </code></pre> <p>Then I use the following code in my Cart model to encrypt the data:</p> <pre><code>class Cart &lt; ActiveRecord::Base has_many :line_items, :dependent =&gt; :destroy PAYPAL_CERT_PEM = File.read("#{Rails.root}/#{PAYPAL_CONFIG[:paypal_cert_file]}") APP_CERT_PEM = File.read("#{Rails.root}/#{PAYPAL_CONFIG[:app_cert_file]}") APP_KEY_PEM = File.read("#{Rails.root}/#{PAYPAL_CONFIG[:app_key_file]}") ... def paypal_data(return_url, notify_url) values = { :business =&gt; PAYPAL_CONFIG[:user], :cert_id =&gt; PAYPAL_CONFIG[:cert_id], :custom =&gt; PAYPAL_CONFIG[:secret], :cmd =&gt; '_cart', :upload =&gt; 1, :return =&gt; return_url, :notify_url =&gt; notify_url, :invoice =&gt; id, :currency_code =&gt; 'AUD' } line_items.each_with_index do |item, i| values.merge!({ "amount_#{i+1}" =&gt; "%.2f" % item.unit_price_ex_gst, "tax_#{i+1}" =&gt; "%.2f" % item.unit_gst, "item_name_#{i+1}" =&gt; item.product.full_name, "item_number_#{i+1}" =&gt; item.id, "quantity_#{i+1}" =&gt; item.quantity }) end encrypt_for_paypal(values) end def encrypt_for_paypal(values) signed = OpenSSL::PKCS7::sign(OpenSSL::X509::Certificate.new(APP_CERT_PEM), OpenSSL::PKey::RSA.new(APP_KEY_PEM, ''), values.map { |key, value| "#{key}=#{value}" }.join("\n"), [], OpenSSL::PKCS7::BINARY) OpenSSL::PKCS7::encrypt([OpenSSL::X509::Certificate.new(PAYPAL_CERT_PEM)], signed.to_der, OpenSSL::Cipher::Cipher::new("DES3"), OpenSSL::PKCS7::BINARY).to_s.gsub("\n", '') end end </code></pre> <p>Then I use the following code in the view:</p> <pre><code>- form_tag PAYPAL_CONFIG[:action_url] do %div = hidden_field_tag :cmd, '_s-xclick' = hidden_field_tag :encrypted, cart.paypal_data(thanks_payments_url, payments_url) = image_submit_tag 'paypal-checkout.gif', :alt =&gt; 'Check out with PayPal: The safer, easier way to pay' </code></pre> <p>There don't seem to be any newlines or other characters in the output which I am aware can stuff up the process.</p> <p>I have checked and double-checked that I am using all the right certificates and certificate ids, and that what has been uploaded to PayPal matches what is in my <code>certs</code> directory.</p> <p>I have completely run out of ideas to try. Any help or ideas would be greatly appreciated.</p>
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    1. COAre you sure you copied the raw HTML from PayPal *exactly* as it was? Make sure there are no extra new lines.
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    2. COI didn't copy any HTML from PayPal. This is a custom integration.
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    3. COIt's working on my development machine, but not on the server. Deployed code base is at the same revision. Certificates are checked into source control and deployed with the code base.
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