Django oscar paypal proplem

[ilya4s...@gmail.com]

Hi everyone,

I tried to setup django oscar paypal on a website, but I always get an error "User authentication failed".

I had found some reasons and fixed it:

• Invalid Processor information entered. Contact merchant bank to verify. — I use PayPal
  
• "Allowed IP Address" security feature implemented. The transaction is coming from an unknown IP address. For more information, refer to Allowed IP Addresses. — added the website IP 
  
• You are using a test (not active) account to submit a transaction to the live PayPal servers. Change the URL from pilot-payflowpro.paypal.com to payflowpro.paypal.com. —  set PAYPAL_PAYFLOW_PRODUCTION_MODE = False
  

Additional information:

• I use sandbox business pro account
  
• I do not have https on my website
• PayPal Express works great, except a redirect after transaction.

Does anybody have any ideas, what is wrong?