Payments: TRANSACTION VERIFICATION FAILED.

Hey,

I was never able to use the payments-module by Boonex on both platforms (Dolphin and UNA). I get the following error after a successful payment via PayPal (sandbox): TRANSACTION VERIFICATION FAILED.

In the logfile there are entries like:

05-16 16:18:26: Finalize Checkout Failed
05-16 16:18:26: array (
'r' => 'payment/finalize_checkout/paypal/2',
'payer_email' => '[...]',
'payer_id' => 'FENPWQVPCCSNN',
'payer_status' => 'VERIFIED',
'first_name' => 'test',
'last_name' => 'buyer',
'txn_id' => '6GE18003HN457640W',
'mc_currency' => 'EUR',
'mc_fee' => '0.45',
'mc_gross' => '5.00',
'protection_eligibility' => 'ELIGIBLE',
'payment_fee' => '0.45',
'payment_gross' => '5.00',
'payment_status' => 'Completed',
'payment_type' => 'instant',
'item_name1' => 'Test',
'quantity1' => '1',
'mc_gross_1' => '5.00',
'num_cart_items' => '1',
'txn_type' => 'cart',
'payment_date' => '2017-05-16T16:18:16Z',
'business' => '[...]',
'receiver_id' => 'JY8CUJ6TM2SSE',
'notify_version' => 'UNVERSIONED',
'custom' => 'MnwyNQ%3D%3D',
'verify_sign' => 'AFcWxV21C7fd0v3bYYYRCpSSRl31Au6BB2RbbA7UgkNTVOzxDv8a0ZWj',
)

Same error on different UNA and Dolphin installations. May it be a server thing?

I added a product here on UNA and created a new profile. I purchased my test product and it displayed the following message: PAYMENT IS NOT COMPLETED.

Is there something wrong or is it intended this way?