ENGCOM-4780: Fix the invalid currency error in credit card payment of PayPal Payflow Pro or Payments Pro #22399

 - Merge Pull Request #22399 from Hailong/magento2:fix-paypal-payflow-pro-failure-with-cad-currency
 - Merged commits:
   1. 43a22d4

Author: magento-engcom-team

app/code/Magento/Paypal/Model/Payflow/Service/Request/SecureToken.php

@@ -64,6 +64,7 @@ public function requestToken(Quote $quote)
         $request->setTrxtype(Payflowpro::TRXTYPE_AUTH_ONLY);
         $request->setVerbosity('HIGH');
         $request->setAmt(0);
+        $request->setCurrency($quote->getBaseCurrencyCode());
         $request->setCreatesecuretoken('Y');
         $request->setSecuretokenid($this->mathRandom->getUniqueHash());
         $request->setReturnurl($this->url->getUrl('paypal/transparent/response'));