paypal - shows an empty page and says you should login first to use the sandbox -


hi trying integrating paypal standard in nop commerce 2.4. after set required things in admin panel, when don't use sandbox, cart shows alright. but, when enabled "use sand box" , after proceeding payment paypal, site redirect paypal show paypal cart, shows empty page , says should login first use sandbox, message that. when put site in live mode, redirect loads paypal checkout page usual. don't understand what's problem.

i searched internet past few days , stuck in situation.. please me out.

as not rep 10 can't upload image: please see link screen appears cart

when set cart sandbox, used testing. need set developer account paypal @ paypal's developer site. once have developer account set up, need set test sandbox seller , buyer account. configure shopping cart sandbox acct credentials if going testing sandbox. in separate tab, log paypal's developer account if not logged in. in different tab, can go through , test checkout sandbox.


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