Why did I get result code 1?

A result code 1 indicates that the user authentication failed. If you received result 1, ensure you entered the correct user, vendor, partner, and password values. Any of the following situations may have produced this result code: 

You may have entered invalid processor information. Contact the merchant bank to verify that you have the correct processor ID.
You used a test account to submit a transaction to live PayPal servers. Change the host address from the test server URL to the live server URL and try the transaction again.
The "Allowed IP Address" security feature detected that the transaction came from an unknown IP address. For more details on how to update the allowed IP addresses, contact our Manager technical support.