In the last notification, which payment went through successfully, I see this in the list.
This is test account data for sandbox. so, nothing to worry about.
Raw result COMMUNICATION ERROR
Raw data $_GET=array (
'option' => 'com_comprofiler',
'view' => 'pluginclass',
'plugin' => 'cbpaidsubscriptions',
'cbpgacctno' => '31',
'cbppdtback' => 'ba9599081f484bee439ac144992c1b80',
'cbpbasket' => '214',
'do' => 'gw',
'result' => 'notify',
'cbpid' => 'cbp580f1800c44f7650322195',
'format' => 'raw',
'Itemid' => NULL,
'task' => 'pluginclass',
);
$_POST=array (
'mc_gross' => '3.00',
'invoice' => 'U135',
'protection_eligibility' => 'Eligible',
'address_status' => 'confirmed',
'payer_id' => 'KN5JSSX8SMSSG',
'tax' => '0.00',
'address_street' => '1 Main St',
'payment_date' => '03:58:46 Oct 25, 2016 PDT',
'payment_status' => 'Completed',
'charset' => 'windows-1252',
'address_zip' => '95131',
'first_name' => 'fsfd',
'mc_fee' => '0.39',
'address_country_code' => 'US',
'address_name' => 'fsfd sdf',
'notify_version' => '3.8',
'custom' => '214',
'payer_status' => 'verified',
'business' => 'merchant2@kp.com',
'address_country' => 'United States',
'address_city' => 'San Jose',
'quantity' => '1',
'verify_sign' => 'A4TxgShL3JJ9nWQhcePS6JeEs8dzABPAAzAYavyRZzmVpWGPoR-Jq2iP',
'payer_email' => 'reagent007@yandex.re',
'txn_id' => '1W36832300396232D',
'payment_type' => 'instant',
'last_name' => 'sdf',
'address_state' => 'CA',
'receiver_email' => 'merchant2@kp.com',
'payment_fee' => '0.39',
'receiver_id' => 'Z7B28MYPADYJL',
'txn_type' => 'web_accept',
'item_name' => 'Test Subs Plan for tester2',
'mc_currency' => 'USD',
'item_number' => 'S91-582-1',
'residence_country' => 'US',
'test_ipn' => '1',
'handling_amount' => '0.00',
'transaction_subject' => '',
'payment_gross' => '3.00',
'shipping' => '0.00',
'ipn_track_id' => 'd04b4cefb180e',
);
$error='0';
$status='400';
$transaction_info='';
I don't see any errors here.