Fatal error: Uncaught Error: Undefined constant "SBN_CODE" in /home/pushpraj/public_html/paypal/paypalFunctions.php:22 Stack trace: #0 /home/pushpraj/public_html/startPayment.php(11): getAccessToken() #1 {main} thrown in /home/pushpraj/public_html/paypal/paypalFunctions.php on line 22