title: Paypal Buy Now button with variable/dynamic price
body: <p>This is not a duplicate of <a href="https://stackoverflow.com/questions/35848106/how-to-pass-dynamic-amount-in-paypal-buy-now-button">this post</a>.</p>
  
  <p>I quote from the linked post:</p>
  
  <blockquote>
    <p>As of June 29, 2017 I see this not working. Paypal has again changed its rules, and I don't think it any longer accepts hidden HTML fields in the form submission: they must be set in the button editor at Paypal.</p>
  </blockquote>
  
  <p>Paypal documentation is a mess. Half of the links are broken and the other half of the links point to the documentation index.</p>
  
  <p>Does any brain out there know how to achieve a Paypal Payment Button where I can set the price dynamically?</p>