title: Make payment with Paypal-Python-SDK
body: <p>I want to use the Paypal SDK with Python Flask to implement payments with the Paypal method (paypal to paypal, no Visa card or something). I'm trying to understand how things work, and I've got a little problem.</p>
  
  <ol>
  <li><p>First, configure the SDK. Done and understood</p></li>
  <li><p>Then, create a payment URL and redirect the user to it. <a href="https://github.com/paypal/PayPal-Python-SDK/blob/master/samples/payment/create_with_paypal.py" rel="nofollow noreferrer">Done and understood</a></p></li>
  <li><p>Finally, check if the user sent the money. <a href="https://github.com/paypal/PayPal-Python-SDK#execute-payment" rel="nofollow noreferrer">Undone and not understood</a></p>
  
  <pre><code>payment = paypalrestsdk.Payment.find("PAY-57363176S1057143SKE2HO3A")
  </code></pre></li>
  </ol>
  
  <p>What is <code>PAY-57363176S1057143SKE2HO3A</code>? Is that the <code>payment.id</code> seen in <em>2.</em> line 51? If yes, then, what is <code>{"payer_id": "DUFRQ8GWYMJXC"}</code>? There's in this code 2 IDs, and the only reference to an ID in the <code>create_with_paypal.py</code> file is the single <code>payment.id</code>.</p>
  
  <p>Could someone help me, please? Thanks in advance. </p>