Hi, I can't use sandbox testing. Whenever I try, I get the following error message: PayPal cannot process this transaction because of a problem with the seller's website after chaning to use https://ipnpb.sandbox.paypal.com/cgi-bin/webscr. When searhing for this error message I get told to change the language settings under My Selling Tools in my Profile but these settings don't exist so I can't change them. Any idea?
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