title: PHP PayFlow Pro - User Authentication Failed
body: <p>I've tried every API out there for PHP, even including the sample that paypal provided here:
  <a href="https://ppmts.custhelp.com/app/answers/detail/a_id/618" rel="nofollow">https://ppmts.custhelp.com/app/answers/detail/a_id/618</a></p>
  
  <p>The problem is that I set user, vendor, partner, password as described. User is under merchants manage users(I've tried both users), vendor is my merchant login, password is my merchant password, and partner is paypal. I've tried paypal test cards listed on their site, and my cards for live mode.</p>
  
  <p>In every API I've tried I get the same reply (no matter if I go to test mode or live mode): User authentication failed: Vantiv</p>
  
  <p>What does Vantiv stand for? It's not my username or vendor btw.</p>