[Qt] Rework of payment request UI (mainly for insecure pr)

- this shows insecure (unsecured) payment requests in a new yellowish
  colored UI (based on the secure payment request UI) instead of our
  normal payment UI
- allows us to receive paymentACK messages for insecure payment requests
- allows us to handle expirations for insecure payment request
- changed walletmodel, so that all types of payment requests don't touch
  the addressbook

7 files changed, 609 insertions, 82 deletions

diff --git a/src/qt/forms/sendcoinsdialog.ui b/src/qt/forms/sendcoinsdialog.ui
index 67ea45d2fd..7547931ff1 100644
--- a/src/qt/forms/sendcoinsdialog.ui
+++ b/src/qt/forms/sendcoinsdialog.ui
@@ -29,7 +29,16 @@
        </rect>
       </property>
       <layout class="QVBoxLayout" name="verticalLayout_2" stretch="0,1">
-       <property name="margin">
+       <property name="leftMargin">
+        <number>0</number>
+       </property>
+       <property name="topMargin">
+        <number>0</number>
+       </property>
+       <property name="rightMargin">
+        <number>0</number>
+       </property>
+       <property name="bottomMargin">
         <number>0</number>
        </property>
        <item>
diff --git a/src/qt/forms/sendcoinsentry.ui b/src/qt/forms/sendcoinsentry.ui
index db742d633d..199a14598a 100644
--- a/src/qt/forms/sendcoinsentry.ui
+++ b/src/qt/forms/sendcoinsentry.ui
@@ -10,13 +10,19 @@
     <height>150</height>
    </rect>
   </property>
+  <property name="focusPolicy">
+   <enum>Qt::TabFocus</enum>
+  </property>
   <property name="autoFillBackground">
    <bool>false</bool>
   </property>
   <property name="currentIndex">
    <number>0</number>
   </property>
-  <widget class="QFrame" name="SendCoinsInsecure">
+  <widget class="QFrame" name="SendCoins">
+   <property name="toolTip">
+    <string>This is a normal payment.</string>
+   </property>
    <property name="frameShape">
     <enum>QFrame::StyledPanel</enum>
    </property>
@@ -143,7 +149,495 @@
     </item>
    </layout>
   </widget>
-  <widget class="QFrame" name="SendCoinsSecure">
+  <widget class="QFrame" name="SendCoins_InsecurePaymentRequest">
+   <property name="palette">
+    <palette>
+     <active>
+      <colorrole role="WindowText">
+       <brush brushstyle="SolidPattern">
+        <color alpha="255">
+         <red>0</red>
+         <green>0</green>
+         <blue>0</blue>
+        </color>
+       </brush>
+      </colorrole>
+      <colorrole role="Button">
+       <brush brushstyle="SolidPattern">
+        <color alpha="255">
+         <red>255</red>
+         <green>255</green>
+         <blue>127</blue>
+        </color>
+       </brush>
+      </colorrole>
+      <colorrole role="Light">
+       <brush brushstyle="SolidPattern">
+        <color alpha="255">
+         <red>255</red>
+         <green>255</green>
+         <blue>255</blue>
+        </color>
+       </brush>
+      </colorrole>
+      <colorrole role="Midlight">
+       <brush brushstyle="SolidPattern">
+        <color alpha="255">
+         <red>255</red>
+         <green>255</green>
+         <blue>191</blue>
+        </color>
+       </brush>
+      </colorrole>
+      <colorrole role="Dark">
+       <brush brushstyle="SolidPattern">
+        <color alpha="255">
+         <red>127</red>
+         <green>127</green>
+         <blue>63</blue>
+        </color>
+       </brush>
+      </colorrole>
+      <colorrole role="Mid">
+       <brush brushstyle="SolidPattern">
+        <color alpha="255">
+         <red>170</red>
+         <green>170</green>
+         <blue>84</blue>
+        </color>
+       </brush>
+      </colorrole>
+      <colorrole role="Text">
+       <brush brushstyle="SolidPattern">
+        <color alpha="255">
+         <red>0</red>
+         <green>0</green>
+         <blue>0</blue>
+        </color>
+       </brush>
+      </colorrole>
+      <colorrole role="BrightText">
+       <brush brushstyle="SolidPattern">
+        <color alpha="255">
+         <red>255</red>
+         <green>255</green>
+         <blue>255</blue>
+        </color>
+       </brush>
+      </colorrole>
+      <colorrole role="ButtonText">
+       <brush brushstyle="SolidPattern">
+        <color alpha="255">
+         <red>0</red>
+         <green>0</green>
+         <blue>0</blue>
+        </color>
+       </brush>
+      </colorrole>
+      <colorrole role="Base">
+       <brush brushstyle="SolidPattern">
+        <color alpha="255">
+         <red>255</red>
+         <green>255</green>
+         <blue>255</blue>
+        </color>
+       </brush>
+      </colorrole>
+      <colorrole role="Window">
+       <brush brushstyle="SolidPattern">
+        <color alpha="255">
+         <red>255</red>
+         <green>255</green>
+         <blue>127</blue>
+        </color>
+       </brush>
+      </colorrole>
+      <colorrole role="Shadow">
+       <brush brushstyle="SolidPattern">
+        <color alpha="255">
+         <red>0</red>
+         <green>0</green>
+         <blue>0</blue>
+        </color>
+       </brush>
+      </colorrole>
+      <colorrole role="AlternateBase">
+       <brush brushstyle="SolidPattern">
+        <color alpha="255">
+         <red>255</red>
+         <green>255</green>
+         <blue>191</blue>
+        </color>
+       </brush>
+      </colorrole>
+      <colorrole role="ToolTipBase">
+       <brush brushstyle="SolidPattern">
+        <color alpha="255">
+         <red>255</red>
+         <green>255</green>
+         <blue>220</blue>
+        </color>
+       </brush>
+      </colorrole>
+      <colorrole role="ToolTipText">
+       <brush brushstyle="SolidPattern">
+        <color alpha="255">
+         <red>0</red>
+         <green>0</green>
+         <blue>0</blue>
+        </color>
+       </brush>
+      </colorrole>
+     </active>
+     <inactive>
+      <colorrole role="WindowText">
+       <brush brushstyle="SolidPattern">
+        <color alpha="255">
+         <red>0</red>
+         <green>0</green>
+         <blue>0</blue>
+        </color>
+       </brush>
+      </colorrole>
+      <colorrole role="Button">
+       <brush brushstyle="SolidPattern">
+        <color alpha="255">
+         <red>255</red>
+         <green>255</green>
+         <blue>127</blue>
+        </color>
+       </brush>
+      </colorrole>
+      <colorrole role="Light">
+       <brush brushstyle="SolidPattern">
+        <color alpha="255">
+         <red>255</red>
+         <green>255</green>
+         <blue>255</blue>
+        </color>
+       </brush>
+      </colorrole>
+      <colorrole role="Midlight">
+       <brush brushstyle="SolidPattern">
+        <color alpha="255">
+         <red>255</red>
+         <green>255</green>
+         <blue>191</blue>
+        </color>
+       </brush>
+      </colorrole>
+      <colorrole role="Dark">
+       <brush brushstyle="SolidPattern">
+        <color alpha="255">
+         <red>127</red>
+         <green>127</green>
+         <blue>63</blue>
+        </color>
+       </brush>
+      </colorrole>
+      <colorrole role="Mid">
+       <brush brushstyle="SolidPattern">
+        <color alpha="255">
+         <red>170</red>
+         <green>170</green>
+         <blue>84</blue>
+        </color>
+       </brush>
+      </colorrole>
+      <colorrole role="Text">
+       <brush brushstyle="SolidPattern">
+        <color alpha="255">
+         <red>0</red>
+         <green>0</green>
+         <blue>0</blue>
+        </color>
+       </brush>
+      </colorrole>
+      <colorrole role="BrightText">
+       <brush brushstyle="SolidPattern">
+        <color alpha="255">
+         <red>255</red>
+         <green>255</green>
+         <blue>255</blue>
+        </color>
+       </brush>
+      </colorrole>
+      <colorrole role="ButtonText">
+       <brush brushstyle="SolidPattern">
+        <color alpha="255">
+         <red>0</red>
+         <green>0</green>
+         <blue>0</blue>
+        </color>
+       </brush>
+      </colorrole>
+      <colorrole role="Base">
+       <brush brushstyle="SolidPattern">
+        <color alpha="255">
+         <red>255</red>
+         <green>255</green>
+         <blue>255</blue>
+        </color>
+       </brush>
+      </colorrole>
+      <colorrole role="Window">
+       <brush brushstyle="SolidPattern">
+        <color alpha="255">
+         <red>255</red>
+         <green>255</green>
+         <blue>127</blue>
+        </color>
+       </brush>
+      </colorrole>
+      <colorrole role="Shadow">
+       <brush brushstyle="SolidPattern">
+        <color alpha="255">
+         <red>0</red>
+         <green>0</green>
+         <blue>0</blue>
+        </color>
+       </brush>
+      </colorrole>
+      <colorrole role="AlternateBase">
+       <brush brushstyle="SolidPattern">
+        <color alpha="255">
+         <red>255</red>
+         <green>255</green>
+         <blue>191</blue>
+        </color>
+       </brush>
+      </colorrole>
+      <colorrole role="ToolTipBase">
+       <brush brushstyle="SolidPattern">
+        <color alpha="255">
+         <red>255</red>
+         <green>255</green>
+         <blue>220</blue>
+        </color>
+       </brush>
+      </colorrole>
+      <colorrole role="ToolTipText">
+       <brush brushstyle="SolidPattern">
+        <color alpha="255">
+         <red>0</red>
+         <green>0</green>
+         <blue>0</blue>
+        </color>
+       </brush>
+      </colorrole>
+     </inactive>
+     <disabled>
+      <colorrole role="WindowText">
+       <brush brushstyle="SolidPattern">
+        <color alpha="255">
+         <red>127</red>
+         <green>127</green>
+         <blue>63</blue>
+        </color>
+       </brush>
+      </colorrole>
+      <colorrole role="Button">
+       <brush brushstyle="SolidPattern">
+        <color alpha="255">
+         <red>255</red>
+         <green>255</green>
+         <blue>127</blue>
+        </color>
+       </brush>
+      </colorrole>
+      <colorrole role="Light">
+       <brush brushstyle="SolidPattern">
+        <color alpha="255">
+         <red>255</red>
+         <green>255</green>
+         <blue>255</blue>
+        </color>
+       </brush>
+      </colorrole>
+      <colorrole role="Midlight">
+       <brush brushstyle="SolidPattern">
+        <color alpha="255">
+         <red>255</red>
+         <green>255</green>
+         <blue>191</blue>
+        </color>
+       </brush>
+      </colorrole>
+      <colorrole role="Dark">
+       <brush brushstyle="SolidPattern">
+        <color alpha="255">
+         <red>127</red>
+         <green>127</green>
+         <blue>63</blue>
+        </color>
+       </brush>
+      </colorrole>
+      <colorrole role="Mid">
+       <brush brushstyle="SolidPattern">
+        <color alpha="255">
+         <red>170</red>
+         <green>170</green>
+         <blue>84</blue>
+        </color>
+       </brush>
+      </colorrole>
+      <colorrole role="Text">
+       <brush brushstyle="SolidPattern">
+        <color alpha="255">
+         <red>127</red>
+         <green>127</green>
+         <blue>63</blue>
+        </color>
+       </brush>
+      </colorrole>
+      <colorrole role="BrightText">
+       <brush brushstyle="SolidPattern">
+        <color alpha="255">
+         <red>255</red>
+         <green>255</green>
+         <blue>255</blue>
+        </color>
+       </brush>
+      </colorrole>
+      <colorrole role="ButtonText">
+       <brush brushstyle="SolidPattern">
+        <color alpha="255">
+         <red>127</red>
+         <green>127</green>
+         <blue>63</blue>
+        </color>
+       </brush>
+      </colorrole>
+      <colorrole role="Base">
+       <brush brushstyle="SolidPattern">
+        <color alpha="255">
+         <red>255</red>
+         <green>255</green>
+         <blue>127</blue>
+        </color>
+       </brush>
+      </colorrole>
+      <colorrole role="Window">
+       <brush brushstyle="SolidPattern">
+        <color alpha="255">
+         <red>255</red>
+         <green>255</green>
+         <blue>127</blue>
+        </color>
+       </brush>
+      </colorrole>
+      <colorrole role="Shadow">
+       <brush brushstyle="SolidPattern">
+        <color alpha="255">
+         <red>0</red>
+         <green>0</green>
+         <blue>0</blue>
+        </color>
+       </brush>
+      </colorrole>
+      <colorrole role="AlternateBase">
+       <brush brushstyle="SolidPattern">
+        <color alpha="255">
+         <red>255</red>
+         <green>255</green>
+         <blue>127</blue>
+        </color>
+       </brush>
+      </colorrole>
+      <colorrole role="ToolTipBase">
+       <brush brushstyle="SolidPattern">
+        <color alpha="255">
+         <red>255</red>
+         <green>255</green>
+         <blue>220</blue>
+        </color>
+       </brush>
+      </colorrole>
+      <colorrole role="ToolTipText">
+       <brush brushstyle="SolidPattern">
+        <color alpha="255">
+         <red>0</red>
+         <green>0</green>
+         <blue>0</blue>
+        </color>
+       </brush>
+      </colorrole>
+     </disabled>
+    </palette>
+   </property>
+   <property name="toolTip">
+    <string>This is an unverified payment request.</string>
+   </property>
+   <property name="autoFillBackground">
+    <bool>true</bool>
+   </property>
+   <property name="frameShape">
+    <enum>QFrame::StyledPanel</enum>
+   </property>
+   <property name="frameShadow">
+    <enum>QFrame::Sunken</enum>
+   </property>
+   <layout class="QGridLayout" name="gridLayout_is">
+    <property name="spacing">
+     <number>12</number>
+    </property>
+    <item row="4" column="0">
+     <widget class="QLabel" name="memoLabel_is">
+      <property name="text">
+       <string>Memo:</string>
+      </property>
+      <property name="alignment">
+       <set>Qt::AlignRight|Qt::AlignTrailing|Qt::AlignVCenter</set>
+      </property>
+     </widget>
+    </item>
+    <item row="5" column="0">
+     <widget class="QLabel" name="amountLabel_is">
+      <property name="text">
+       <string>Amount:</string>
+      </property>
+      <property name="alignment">
+       <set>Qt::AlignRight|Qt::AlignTrailing|Qt::AlignVCenter</set>
+      </property>
+     </widget>
+    </item>
+    <item row="3" column="0">
+     <widget class="QLabel" name="payToLabel_is">
+      <property name="text">
+       <string>Pay To:</string>
+      </property>
+      <property name="alignment">
+       <set>Qt::AlignRight|Qt::AlignTrailing|Qt::AlignVCenter</set>
+      </property>
+     </widget>
+    </item>
+    <item row="5" column="2">
+     <widget class="BitcoinAmountField" name="payAmount_is">
+      <property name="acceptDrops">
+       <bool>false</bool>
+      </property>
+     </widget>
+    </item>
+    <item row="3" column="2">
+     <layout class="QHBoxLayout" name="payToLayout_is">
+      <property name="spacing">
+       <number>0</number>
+      </property>
+      <item>
+       <widget class="QLabel" name="payTo_is"/>
+      </item>
+     </layout>
+    </item>
+    <item row="4" column="2">
+     <widget class="QLabel" name="memoTextLabel_is">
+      <property name="textFormat">
+       <enum>Qt::PlainText</enum>
+      </property>
+     </widget>
+    </item>
+   </layout>
+  </widget>
+  <widget class="QFrame" name="SendCoins_SecurePaymentRequest">
    <property name="palette">
     <palette>
      <active>
@@ -586,6 +1080,9 @@
      </disabled>
     </palette>
    </property>
+   <property name="toolTip">
+    <string>This is a verified payment request.</string>
+   </property>
    <property name="autoFillBackground">
     <bool>true</bool>
    </property>
@@ -607,35 +1104,26 @@
       <property name="alignment">
        <set>Qt::AlignRight|Qt::AlignTrailing|Qt::AlignVCenter</set>
       </property>
-      <property name="buddy">
-       <cstring>addAsLabel</cstring>
-      </property>
      </widget>
     </item>
     <item row="5" column="0">
      <widget class="QLabel" name="amountLabel_s">
       <property name="text">
-       <string>A&amp;mount:</string>
+       <string>Amount:</string>
       </property>
       <property name="alignment">
        <set>Qt::AlignRight|Qt::AlignTrailing|Qt::AlignVCenter</set>
       </property>
-      <property name="buddy">
-       <cstring>payAmount_s</cstring>
-      </property>
      </widget>
     </item>
     <item row="3" column="0">
      <widget class="QLabel" name="payToLabel_s">
       <property name="text">
-       <string>Pay &amp;To:</string>
+       <string>Pay To:</string>
       </property>
       <property name="alignment">
        <set>Qt::AlignRight|Qt::AlignTrailing|Qt::AlignVCenter</set>
       </property>
-      <property name="buddy">
-       <cstring>payTo_s</cstring>
-      </property>
      </widget>
     </item>
     <item row="5" column="2">
diff --git a/src/qt/paymentserver.cpp b/src/qt/paymentserver.cpp
index 0f386680ac..50847c4c48 100644
--- a/src/qt/paymentserver.cpp
+++ b/src/qt/paymentserver.cpp
@@ -280,9 +280,6 @@ PaymentServer::PaymentServer(QObject* parent, bool startLocalServer) :
             connect(this, SIGNAL(receivedPaymentACK(QString)), this, SLOT(handlePaymentACK(QString)));
         }
     }
-
-    // netManager is null until uiReady() is called
-    netManager = NULL;
 }
 
 PaymentServer::~PaymentServer()
@@ -450,9 +447,36 @@ bool PaymentServer::processPaymentRequest(PaymentRequestPlus& request, QList<Sen
     if (!optionsModel)
         return false;
 
-    QList<std::pair<CScript,qint64> > sendingTos = request.getPayTo();
-    qint64 totalAmount = 0;
+    recipients.append(SendCoinsRecipient());
+
+    recipients[0].paymentRequest = request;
+    recipients[0].label = GUIUtil::HtmlEscape(request.getDetails().memo()); // Todo: Change to .message once available
+
+    request.getMerchant(PaymentServer::certStore, recipients[0].authenticatedMerchant);
+
+    QList<std::pair<CScript, qint64> > sendingTos = request.getPayTo();
+
+    int i = 0;
     foreach(const PAIRTYPE(CScript, qint64)& sendingTo, sendingTos) {
+        // Extract and check destination addresses
+        CTxDestination dest;
+        if (ExtractDestination(sendingTo.first, dest)) {
+            // Append destination address (for payment requests .address is used ONLY for GUI display)
+            recipients[0].address.append(QString::fromStdString(CBitcoinAddress(dest).ToString()));
+            if (i < sendingTos.size() - 1) // prevent new-line for last entry
+                recipients[0].address.append("<br />");
+        }
+        else if (!recipients[0].authenticatedMerchant.isEmpty()){
+            // Insecure payments to custom bitcoin addresses are not supported
+            // (there is no good way to tell the user where they are paying in a way
+            // they'd have a chance of understanding).
+            emit message(tr("Payment request error"),
+                tr("Unverified payment requests to custom payment scripts are unsupported."),
+                CClientUIInterface::MSG_ERROR);
+            return false;
+        }
+
+        // Extract and check amounts
         CTxOut txOut(sendingTo.second, sendingTo.first);
         if (txOut.IsDust(CTransaction::nMinRelayTxFee)) {
             QString msg = tr("Requested payment amount of %1 is too small (considered dust).")
@@ -463,43 +487,17 @@ bool PaymentServer::processPaymentRequest(PaymentRequestPlus& request, QList<Sen
             return false;
         }
 
-        totalAmount += sendingTo.second;
+        recipients[0].amount += sendingTo.second;
+        i++;
     }
+    // Store addresses and format them to fit nicely into the GUI
+    recipient.address = addresses.join("<br />");
 
-    recipients.append(SendCoinsRecipient());
-
-    if (request.getMerchant(PaymentServer::certStore, recipients[0].authenticatedMerchant)) {
-        recipients[0].paymentRequest = request;
-        recipients[0].amount = totalAmount;
-        qDebug() << "PaymentServer::processPaymentRequest : Payment request from " << recipients[0].authenticatedMerchant;
+    if (!recipient.authenticatedMerchant.isEmpty()) {
+        qDebug() << "PaymentServer::processPaymentRequest : Secure payment request from " << recipient.authenticatedMerchant;
     }
     else {
-        recipients.clear();
-        // Insecure payment requests may turn into more than one recipient if
-        // the merchant is requesting payment to more than one address.
-        for (int i = 0; i < sendingTos.size(); i++) {
-            std::pair<CScript, qint64>& sendingTo = sendingTos[i];
-            recipients.append(SendCoinsRecipient());
-            recipients[i].amount = sendingTo.second;
-            QString memo = QString::fromStdString(request.getDetails().memo());
-            recipients[i].label = GUIUtil::HtmlEscape(memo);
-            CTxDestination dest;
-            if (ExtractDestination(sendingTo.first, dest)) {
-                if (i == 0) // Tie request to first pay-to, we don't want multiple ACKs
-                    recipients[i].paymentRequest = request;
-                recipients[i].address = QString::fromStdString(CBitcoinAddress(dest).ToString());
-                qDebug() << "PaymentServer::processPaymentRequest : Payment request, insecure " << recipients[i].address;
-            }
-            else {
-                // Insecure payments to custom bitcoin addresses are not supported
-                // (there is no good way to tell the user where they are paying in a way
-                // they'd have a chance of understanding).
-                emit message(tr("Payment request error"),
-                    tr("Insecure requests to custom payment scripts unsupported"),
-                    CClientUIInterface::MSG_ERROR);
-                return false;
-            }
-        }
+        qDebug() << "PaymentServer::processPaymentRequest : Insecure payment request to " << addresses.join(", ");
     }
 
     return true;
diff --git a/src/qt/sendcoinsdialog.cpp b/src/qt/sendcoinsdialog.cpp
index 51304bc05c..56079bb35f 100644
--- a/src/qt/sendcoinsdialog.cpp
+++ b/src/qt/sendcoinsdialog.cpp
@@ -102,7 +102,7 @@ void SendCoinsDialog::on_sendButton_clicked()
 
         QString recipientElement;
 
-        if (rcp.authenticatedMerchant.isEmpty())
+        if (!rcp.paymentRequest.IsInitialized()) // normal payment
         {
             if(rcp.label.length() > 0) // label with address
             {
@@ -114,10 +114,14 @@ void SendCoinsDialog::on_sendButton_clicked()
                 recipientElement = tr("%1 to %2").arg(amount, address);
             }
         }
-        else // just merchant
+        else if(!rcp.authenticatedMerchant.isEmpty()) // secure payment request
         {
             recipientElement = tr("%1 to %2").arg(amount, GUIUtil::HtmlEscape(rcp.authenticatedMerchant));
         }
+        else // insecure payment request
+        {
+            recipientElement = tr("%1 to %2").arg(amount, address);
+        }
 
         formatted.append(recipientElement);
     }
@@ -313,7 +317,7 @@ void SendCoinsDialog::pasteEntry(const SendCoinsRecipient &rv)
 bool SendCoinsDialog::handlePaymentRequest(const SendCoinsRecipient &rv)
 {
     QString strSendCoins = tr("Send Coins");
-    if (!rv.authenticatedMerchant.isEmpty()) {
+    if (rv.paymentRequest.IsInitialized()) {
         // Expired payment request?
         const payments::PaymentDetails& details = rv.paymentRequest.getDetails();
         if (details.has_expires() && (int64)details.expires() < GetTime())
diff --git a/src/qt/sendcoinsentry.cpp b/src/qt/sendcoinsentry.cpp
index 2d42ecb568..e833274256 100644
--- a/src/qt/sendcoinsentry.cpp
+++ b/src/qt/sendcoinsentry.cpp
@@ -18,7 +18,7 @@ SendCoinsEntry::SendCoinsEntry(QWidget *parent) :
 {
     ui->setupUi(this);
 
-    setCurrentWidget(ui->SendCoinsInsecure);
+    setCurrentWidget(ui->SendCoins);
 
 #ifdef Q_OS_MAC
     ui->payToLayout->setSpacing(4);
@@ -28,10 +28,12 @@ SendCoinsEntry::SendCoinsEntry(QWidget *parent) :
     ui->addAsLabel->setPlaceholderText(tr("Enter a label for this address to add it to your address book"));
     ui->payTo->setPlaceholderText(tr("Enter a Bitcoin address (e.g. 1NS17iag9jJgTHD1VXjvLCEnZuQ3rJDE9L)"));
 #endif
-    setFocusPolicy(Qt::TabFocus);
     setFocusProxy(ui->payTo);
 
+    // normal bitcoin address field
     GUIUtil::setupAddressWidget(ui->payTo, this);
+    // just a label for displaying bitcoin address(es)
+    ui->payTo_is->setFont(GUIUtil::bitcoinAddressFont());
 }
 
 SendCoinsEntry::~SendCoinsEntry()
@@ -67,7 +69,7 @@ void SendCoinsEntry::setModel(WalletModel *model)
 {
     this->model = model;
 
-    if(model && model->getOptionsModel())
+    if (model && model->getOptionsModel())
         connect(model->getOptionsModel(), SIGNAL(displayUnitChanged(int)), this, SLOT(updateDisplayUnit()));
 
     clear();
@@ -80,11 +82,15 @@ void SendCoinsEntry::setRemoveEnabled(bool enabled)
 
 void SendCoinsEntry::clear()
 {
-    // clear UI elements for insecure payments
+    // clear UI elements for normal payment
     ui->payTo->clear();
     ui->addAsLabel->clear();
     ui->payAmount->clear();
-    // and the ones for secure payments just to be sure
+    // clear UI elements for insecure payment request
+    ui->payTo_is->clear();
+    ui->memoTextLabel_is->clear();
+    ui->payAmount_is->clear();
+    // clear UI elements for secure payment request
     ui->payTo_s->clear();
     ui->memoTextLabel_s->clear();
     ui->payAmount_s->clear();
@@ -102,20 +108,23 @@ void SendCoinsEntry::on_deleteButton_clicked()
 
 bool SendCoinsEntry::validate()
 {
+    if (!model)
+        return false;
+
     // Check input validity
     bool retval = true;
 
-    if (!recipient.authenticatedMerchant.isEmpty())
+    // Skip checks for payment request
+    if (recipient.paymentRequest.IsInitialized())
         return retval;
 
-    if (!ui->payTo->hasAcceptableInput() ||
-        (model && !model->validateAddress(ui->payTo->text())))
+    if (!ui->payTo->hasAcceptableInput() || !model->validateAddress(ui->payTo->text()))
     {
         ui->payTo->setValid(false);
         retval = false;
     }
 
-    if(!ui->payAmount->validate())
+    if (!ui->payAmount->validate())
     {
         retval = false;
     }
@@ -131,10 +140,11 @@ bool SendCoinsEntry::validate()
 
 SendCoinsRecipient SendCoinsEntry::getValue()
 {
-    if (!recipient.authenticatedMerchant.isEmpty())
+    // Payment request
+    if (recipient.paymentRequest.IsInitialized())
         return recipient;
 
-    // User-entered or non-authenticated:
+    // Normal payment
     recipient.address = ui->payTo->text();
     recipient.label = ui->addAsLabel->text();
     recipient.amount = ui->payAmount->value();
@@ -156,22 +166,31 @@ void SendCoinsEntry::setValue(const SendCoinsRecipient &value)
 {
     recipient = value;
 
-    if (recipient.authenticatedMerchant.isEmpty())
+    if (recipient.paymentRequest.IsInitialized()) // payment request
+    {
+        if (recipient.authenticatedMerchant.isEmpty()) // insecure
+        {
+            ui->payTo_is->setText(recipient.address);
+            ui->memoTextLabel_is->setText(recipient.label);
+            ui->payAmount_is->setValue(recipient.amount);
+            ui->payAmount_is->setReadOnly(true);
+            setCurrentWidget(ui->SendCoins_InsecurePaymentRequest);
+        }
+        else // secure
+        {
+            ui->payTo_s->setText(recipient.authenticatedMerchant);
+            ui->memoTextLabel_s->setText(recipient.label);
+            ui->payAmount_s->setValue(recipient.amount);
+            ui->payAmount_s->setReadOnly(true);
+            setCurrentWidget(ui->SendCoins_SecurePaymentRequest);
+        }
+    }
+    else // normal payment
     {
         ui->payTo->setText(recipient.address);
         ui->addAsLabel->setText(recipient.label);
         ui->payAmount->setValue(recipient.amount);
     }
-    else
-    {
-        const payments::PaymentDetails& details = recipient.paymentRequest.getDetails();
-
-        ui->payTo_s->setText(recipient.authenticatedMerchant);
-        ui->memoTextLabel_s->setText(QString::fromStdString(details.memo()));
-        ui->payAmount_s->setValue(recipient.amount);
-        ui->payAmount_s->setReadOnly(true);
-        setCurrentWidget(ui->SendCoinsSecure);
-    }
 }
 
 void SendCoinsEntry::setAddress(const QString &address)
@@ -182,7 +201,7 @@ void SendCoinsEntry::setAddress(const QString &address)
 
 bool SendCoinsEntry::isClear()
 {
-    return ui->payTo->text().isEmpty() && ui->payTo_s->text().isEmpty();
+    return ui->payTo->text().isEmpty() && ui->payTo_is->text().isEmpty() && ui->payTo_s->text().isEmpty();
 }
 
 void SendCoinsEntry::setFocus()
@@ -196,6 +215,7 @@ void SendCoinsEntry::updateDisplayUnit()
     {
         // Update payAmount with the current unit
         ui->payAmount->setDisplayUnit(model->getOptionsModel()->getDisplayUnit());
+        ui->payAmount_is->setDisplayUnit(model->getOptionsModel()->getDisplayUnit());
         ui->payAmount_s->setDisplayUnit(model->getOptionsModel()->getDisplayUnit());
     }
 }
diff --git a/src/qt/walletmodel.cpp b/src/qt/walletmodel.cpp
index 417bac9928..8086d6b5bb 100644
--- a/src/qt/walletmodel.cpp
+++ b/src/qt/walletmodel.cpp
@@ -258,8 +258,8 @@ WalletModel::SendCoinsReturn WalletModel::sendCoins(WalletModelTransaction &tran
     // and emit coinsSent signal for each recipient
     foreach(const SendCoinsRecipient &rcp, transaction.getRecipients())
     {
-        // Don't touch the address book when we have a secure payment-request
-        if (rcp.authenticatedMerchant.isEmpty())
+        // Don't touch the address book when we have a payment request
+        if (!rcp.paymentRequest.IsInitialized())
         {
             std::string strAddress = rcp.address.toStdString();
             CTxDestination dest = CBitcoinAddress(strAddress).Get();
diff --git a/src/qt/walletmodel.h b/src/qt/walletmodel.h
index 2e99eaddcb..59227bb743 100644
--- a/src/qt/walletmodel.h
+++ b/src/qt/walletmodel.h
@@ -25,14 +25,22 @@ public:
     explicit SendCoinsRecipient(const QString &addr, const QString &label, quint64 amount, const QString &message):
         address(addr), label(label), amount(amount), message(message) {}
 
+    // If from an insecure payment request, this is used for storing
+    // the addresses, e.g. address-A<br />address-B<br />address-C.
+    // Info: As we don't need to process addresses in here when using
+    // payment requests, we can abuse it for displaying an address list.
+    // Todo: This is a hack, should be replaced with a cleaner solution!
     QString address;
+    // If from a payment request, this is used for storing the memo
+    // Todo: This is a hack, should be replaced with a cleaner solution!
     QString label;
     qint64 amount;
     QString message;
 
     // If from a payment request, paymentRequest.IsInitialized() will be true
     PaymentRequestPlus paymentRequest;
-    QString authenticatedMerchant; // Empty if no authentication or invalid signature/cert/etc.
+    // Empty if no authentication or invalid signature/cert/etc.
+    QString authenticatedMerchant;
 };
 
 /** Interface to Bitcoin wallet from Qt view code. */
@@ -160,7 +168,7 @@ signals:
     // this means that the unlocking failed or was cancelled.
     void requireUnlock();
 
-    // Asynchronous message notification
+    // Fired when a message should be reported to the user
     void message(const QString &title, const QString &message, unsigned int style);
 
     // Coins sent: from wallet, to recipient, in (serialized) transaction: