We recently have signed up with PayPal PayFlow Pro to accept recurring payments. When we were connected to PayPal (just plain simple) , things were working fine. Since we have migrated to Payflow Pro, we are unable to connect to it. Error is "The PayPal gateway rejected the request. User authentication failed". I can see correct API username and password being passed to PayPal. In the log files I see 'response' => array ( 'RESULT' => '1', 'RESPMSG' => 'User authentication failed', ),

and main.CRITICAL: PayPal gateway errors: User authentication failed. {"exception":"[object] (Exception(code: 0): PayPal gateway errors: User authentication failed. at /home/amibook/public_html/vendor/magento/module-paypal/Model/Api/PayflowNvp.php:650)"} []

and Trace: #1 Magento\Paypal\Model\Api\Nvp->call('SetExpressChecko...', array('TENDER' => 'P', ............ 'BUTTONSOURCE' => 'Magento_Cart_Com...')) called at [vendor/magento/module-paypal/Model/Api/Nvp.php:833]

We are using Magento CE 2.3.4. Any help will be really appreciated.

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