מציאת משתנה נעלם

[אדיר]

return_url	The URL to which the sender’s browser is redirected after approving a payment on paypal.com. Use the pay key to identify the payment as follows: payKey=${payKey}.
cancel_url	The URL to which the sender’s browser is redirected if the sender cancels the approval for a payment on paypal.com. Use the pay key to identify the payment as follows: payKey=${payKey}.

[dabi]

נכתב במקור על ידי אדיר

return_url	The URL to which the sender’s browser is redirected after approving a payment on paypal.com. Use the pay key to identify the payment as follows: payKey=${payKey}.
cancel_url	The URL to which the sender’s browser is redirected if the sender cancels the approval for a payment on paypal.com. Use the pay key to identify the payment as follows: payKey=${payKey}.

את המשתנה הזה ניסיתי

PHP קוד:

      $p->add_field('return_url', 'http://www.ynet.co.il'); 


אך הוא לא חוזר אוטומטי לשום אתר אלא מראה

http://up367.siz.co.il/up2/u4gxmyojjmyz.gif