diff --git a/src/main/java/tech/iBeans/POSware/Lite/OnTransact.java b/src/main/java/tech/iBeans/POSware/Lite/OnTransact.java
index fae9b0b..00f0e7b 100644
--- a/src/main/java/tech/iBeans/POSware/Lite/OnTransact.java
+++ b/src/main/java/tech/iBeans/POSware/Lite/OnTransact.java
@@ -6,9 +6,11 @@ package tech.iBeans.POSware.Lite;
 import java.util.*;
 import javax.swing.*;
 import javax.swing.event.*;
+import java.awt.event.*;
 import tech.iBeans.POSware.Lite.transact;
 import tech.iBeans.POSware.Lite.WindowManagement;
 import tech.iBeans.POSware.Lite.receipt;
+import tech.iBeans.POSware.Lite.OnPayment;
 
 /**
  *
@@ -24,13 +26,7 @@ public class OnTransact extends javax.swing.JFrame {
 		initComponents();
 	}
 
-	/**
-	 * This method is called from within the constructor to initialize the form.
-	 * WARNING: Do NOT modify this code. The content of this method is always
-	 * regenerated by the Form Editor.
-	 */
-	@SuppressWarnings("unchecked")
-	// <editor-fold defaultstate="collapsed" desc="Generated Code">//GEN-BEGIN:initComponents
+	
 	private void initComponents() {
 		java.awt.GridBagConstraints gridBagConstraints;
 
@@ -241,14 +237,15 @@ public class OnTransact extends javax.swing.JFrame {
 		gridBagConstraints.gridy = 2;
 		gridBagConstraints.fill = java.awt.GridBagConstraints.BOTH;
 		gridBagConstraints.weightx = 1.0;
-		jPanel_Inventory.add(jPanel_Inventory_Actions, gridBagConstraints);
-
+		
 		jList1_Inventory.setModel(refresh_inventory_list());
 		jList1_Inventory.addListSelectionListener(new javax.swing.event.ListSelectionListener() {
 			public void valueChanged(javax.swing.event.ListSelectionEvent evt) {
 				jList1_InventoryValueChanged(evt);
 			}
 		});
+		
+		jPanel_Inventory.add(jPanel_Inventory_Actions, gridBagConstraints);
 		jScrollPane_Inventory.setViewportView(jList1_Inventory);
 
 		gridBagConstraints = new java.awt.GridBagConstraints();
@@ -318,6 +315,9 @@ public class OnTransact extends javax.swing.JFrame {
 
 		getContentPane().add(jPanel_Main, java.awt.BorderLayout.CENTER);
 
+		// Add action listeners. 
+		jButton_Action_Pay.addActionListener(select_payment);
+
 		pack();
 	}// </editor-fold>
 
@@ -598,7 +598,13 @@ public class OnTransact extends javax.swing.JFrame {
 		return(state);
 	};
 	
-	
+	// Action events. 
+	ActionListener select_payment = new ActionListener() {
+		public void actionPerformed(ActionEvent e) {
+			transact.pay();
+			OnPayment.display();		
+		};
+	};
 	
 	
 
diff --git a/src/main/java/tech/iBeans/POSware/Lite/payment.java b/src/main/java/tech/iBeans/POSware/Lite/payment.java
index 0ff7490..2dfab23 100644
--- a/src/main/java/tech/iBeans/POSware/Lite/payment.java
+++ b/src/main/java/tech/iBeans/POSware/Lite/payment.java
@@ -1,5 +1,7 @@
 package tech.iBeans.POSware.Lite;
 
+import tech.iBeans.POSware.Lite.receipt.*;
+
 // Import module
 import java.util.*;
 import java.math.*;
@@ -8,26 +10,28 @@ public class payment{
 	public static Float total = null;
 	public static Float change = null;
 	public static Float in = null;
+	public static boolean OK = false;
+	public static Boolean state = null;
 
-	public static void init() {
+	public static void init(float TOTAL) {
 		/* Set up the payment.  */
 		change = (float) 0;
 		in = (float) 0;
+		total = TOTAL;
 	};
 
-	public static Float calculate() {
+	public static boolean calculate() {
 		/* Calculate the change. 
 		 * 
-		 * Returns: (float) the calculated change
+		 * Returns: (float) the transaction state
 		 */
 
-
-		if (total > in) {return (null);}; // Do not calculate a smaller change. 
-		change = in - total;
-		return(change);	
+		OK = (total <= in); 
+		if (OK) {change = in - total;}; // Do not calculate a smaller change. 
+		return(OK);	
 	};
 
-	public static Float calculate(float TOTAL, float IN) {
+	public static boolean calculate(float TOTAL, float IN) {
 		/* Calculate the change from a provided total and input. 
 		 * 
 		 * Returns: (float) the calculated change
@@ -39,6 +43,17 @@ public class payment{
 		return(calculate());
 	};
 
+	public static boolean calculate(float IN) {
+		/* Calculate the change from a provided input. 
+		 * 
+		 * Returns: (float) the calculated change
+		 */
+
+		in = IN;
+
+		return(calculate());
+	};
+
 	public static void log() {
 		/* Log the payment.
 		*/