title: PayPal ExpressCheckout (Payflow): Invalid vendor accountError Code: 26
body: <p>This is driving me crazy! I can't get the PayPal express (Payflow?) api to work....</p>
  
  <p><strong>paypal sandbox tells me:</strong></p>
  
  <p>Test Account:   AAAA.B_CCCCCCCCCC_biz@XXXXX.com</p>
  
  <p>API Username:   AAAA.B_CCCCCCCCCC_biz_api1.XXXXX.com</p>
  
  <p>API Password:   DDDDDDDDDD</p>
  
  <p>Signature:  ZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ</p>
  
  <p><strong>in the paypayfunctions.php i wrote:</strong></p>
  
  <p>$API_User="AAAA.B_CCCCCCCCCC_biz@XXXXX.com";</p>
  
  <p>$API_Password="DDDDDDDDDD";</p>
  
  <p>$API_Vendor="AAAA.B_CCCCCCCCCC_biz@XXXXX.com";</p>
  
  <p>$API_Partner="PayPal";</p>
  
  <p>...</p>
  
  <p>And when I test the service, all i get is "<strong>SetExpressCheckoutDetails API call failed. Error Message: Invalid vendor accountError Code: 26</strong>"</p>
  
  <p>The PayPal documentation and examples are terribly complex, all I want to do is having a simple button that links to paypal to start the payment of XXX euro's to account YYYY....</p>
  
  <p>Can anyone help me?</p>
  
  <p>Thanks in advance!</p>