title: Paypal SOLUTIONTYPE=Sole not work for recurring payments
body: <p>i use Paypal ExpressCheckout method for payments.
  I want to allow my users buy without paypal account and using their credit card.
  <a href="http://oi61.tinypic.com/23it5zt.jpg" rel="nofollow">Its work fine</a> when i use one time payment. 
  My payment params (excepts currency, signature, username and password) looks like this:</p>
  
  <pre><code>'amt'=&gt; '300.00', 
  'paymentAction' =&gt; 'Sale',
  'desc' =&gt; 'some desc',
  'qty' =&gt; 1,
  'solutionType' =&gt; 'Sole',  &lt;--this option allow buy by credit card w/o pp account
  'landingPage' =&gt; 'Billing', 
  </code></pre>
  
  <p>But when i want to set up recurring payment, <a href="http://i.stack.imgur.com/XHvW6.png" rel="nofollow">its not working anymore</a>. 
  My recurring payment params:</p>
  
  <pre><code>'amt' =&gt; '300.00',
  'l_billingType0' =&gt; 'RecurringPayments',
  'l_billingAgreementDescription0' =&gt; 'Some desc',
  'solutionType'  =&gt; 'Sole',
  'landingPage'   =&gt; 'Billing',
  </code></pre>
  
  <p>Paypal force user to create pp account in this case :(
  PayPal Account Optional it turned to ON in my pp account ofc. </p>
  
  <p>Any idea what wrong i do?</p>