title: Paypal mass pay soap php integration
body: <p>I want to implement Mass Pay feature and looking over source code for php
  <a href="https://www.x.com/paypal-apis-masspay-php-5.3/soap" rel="nofollow">https://www.x.com/paypal-apis-masspay-php-5.3/soap</a></p>
  
  <p>There is a snippet of a code that goes like this</p>
  
  <pre><code>for($i = 0; $i &lt; 3; $i++) {
      $receiverData = array(  'receiverEmail' =&gt; "user$i@paypal.com",
                              'amount' =&gt; "example_amount",
                              'uniqueID' =&gt; "example_unique_id",
                              'note' =&gt; "example_note");
      $receiversArray[$i] = $receiverData;
  }
  </code></pre>
  
  <p>What exactly is uniqueID and how does that get generated?</p>