check 2 places:
admin desk
admin/modules.php?set=payment
check your paypal setup:
user name
password
signature
front:
includes/modules/payment/paypalwpp.php, near line 1043
$doPayPal = new paypal_curl(array('mode' => 'nvp',
'user' => trim(MODULE_PAYMENT_PAYPALWPP_APIUSERNAME),
'pwd' => trim(MODULE_PAYMENT_PAYPALWPP_APIPASSWORD),
'signature' => trim(MODULE_PAYMENT_PAYPALWPP_APISIGNATURE),
'version' => '3.2',
'server' => MODULE_PAYMENT_PAYPALWPP_SERVER));
$doPayPal->_endpoints = array('live' => 'https://api-3t.paypal.com/nvp',
'sandbox' => 'https://api.sandbox.paypal.com/nvp');
do not use the following code:
$doPayPal = new paypal_curl(array('mode' => 'nvp',
'user' => 'xxxxxxxxxxx',
'pwd' => 'xxxxxxxxxxxxxxxx',
'signature' => 'xxxxxxxxxxxxxxxxxxxxxxxxxxx',
'version' => '3.2',
'server' => MODULE_PAYMENT_PAYPALWPP_SERVER));
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