More invoice work completed invoice payment module

add_invoice_payment_modal.php

@@ -0,0 +1,88 @@
+<div class="modal fade" id="addInvoicePaymentModal" tabindex="-1">
+  <div class="modal-dialog">
+    <div class="modal-content">
+      <div class="modal-header">
+        <h5 class="modal-title"><i class="fa fa-money-bill-alt"></i> New Payment</h5>
+        <button type="button" class="close" data-dismiss="modal">
+          <span aria-hidden="true">&times;</span>
+        </button>
+      </div>
+      <form action="post.php" method="post" autocomplete="off">
+        <input type="hidden" name="invoice_id" value="<?php echo $invoice_id; ?>">
+        <div class="modal-body">
+          <div class="form-row">
+            <div class="form-group col">
+              <label>Date</label>
+              <div class="input-group">
+                <div class="input-group-prepend">
+                  <span class="input-group-text"><i class="fa fa-calendar"></i></span>
+                </div>
+                <input type="date" class="form-control" name="date" value="<?php echo date("Y-m-d"); ?>" required>
+              </div>
+            </div>
+            <div class="form-group col">
+              <label>Amount</label>
+              <div class="input-group">
+                <div class="input-group-prepend">
+                  <span class="input-group-text"><i class="fa fa-dollar-sign"></i></span>
+                </div>
+                <input type="number" class="form-control" step="0.01" min="0" name="amount" value="<?php echo $invoice_amount; ?>" required>
+              </div>
+            </div>
+          </div>
+          <div class="form-row">  
+            <div class="form-group col">
+              <label>Account</label>
+              <div class="input-group"> 
+                <div class="input-group-prepend">
+                  <span class="input-group-text"><i class="fa fa-university"></i></span>
+                </div> 
+                <select class="form-control" name="account" required>
+                  <option value="">- Account -</option>
+                  <?php 
+                  
+                  $sql = mysqli_query($mysqli,"SELECT * FROM accounts"); 
+                  while($row = mysqli_fetch_array($sql)){
+                    $account_id = $row['account_id'];
+                    $account_name = $row['account_name'];
+                  ?>
+                    <option value="<?php echo $account_id; ?>"><?php echo "$account_name"; ?></option>
+                  
+                  <?php
+                  }
+                  ?>
+                </select>
+              </div>
+            </div>
+            <div class="form-group col">
+              <label>Payment Method</label>
+              <div class="input-group"> 
+                <div class="input-group-prepend">
+                  <span class="input-group-text"><i class="fa fa-money-check-alt"></i></span>
+                </div> 
+                <select class="form-control" name="payment_method" required>
+                  <option value="">- Payment Method -</option>
+                  <?php 
+                  
+                  $sql = mysqli_query($mysqli,"SELECT * FROM categories WHERE category_type = 'Payment Method'"); 
+                  while($row = mysqli_fetch_array($sql)){
+                    $category_name = $row['category_name'];
+                  ?>
+                    <option><?php echo "$category_name"; ?></option>
+                  
+                  <?php
+                  }
+                  ?>
+                </select>
+              </div>
+            </div>
+          </div>
+        </div>
+        <div class="modal-footer">
+          <button type="button" class="btn btn-secondary" data-dismiss="modal">Cancel</button>
+          <button type="submit" name="add_invoice_payment" class="btn btn-primary">Save</button>
+        </div>
+      </form>
+    </div>
+  </div>
+</div>

add_invoice_payment_model.php

@@ -0,0 +1,89 @@
+<div class="modal fade" id="addInvoicePaymentModal" tabindex="-1">
+  <div class="modal-dialog modal-lg">
+    <div class="modal-content">
+      <div class="modal-header">
+        <h5 class="modal-title"><i class="fa fa-piggy-bank"></i> New Account</h5>
+        <button type="button" class="close" data-dismiss="modal">
+          <span aria-hidden="true">&times;</span>
+        </button>
+      </div>
+      <form action="post.php" method="post" autocomplete="off">
+        <input type="hidden" name="invoice_id" value="<?php echo $invoice_id; ?>">
+        <div class="modal-body">
+          <div class="form-row">
+            <div class="form-group col-sm-8">
+              <label>Date</label>
+              <div class="input-group">
+                <div class="input-group-prepend">
+                  <span class="input-group-text"><i class="fa fa-calendar"></i></span>
+                </div>
+                <input type="date" class="form-control" name="date" required>
+              </div>
+            </div>
+            <div class="form-group col-sm-4">
+              <label>Amount</label>
+              <div class="input-group">
+                <div class="input-group-prepend">
+                  <span class="input-group-text"><i class="fa fa-usd"></i></span>
+                </div>
+                <input type="number" class="form-control" step="0.01" min="0" name="amount" value="<?php echo $invoice_amount; ?>" required>
+              </div>
+            </div>
+          </div>
+          <div class="form-row">  
+            <div class="form-group col">
+              <label>Account</label>
+              <div class="input-group"> 
+                <div class="input-group-prepend">
+                  <span class="input-group-text"><i class="fa fa-university"></i></span>
+                </div> 
+                <select class="form-control" name="account" required>
+                  <option value="">- Account -</option>
+                  <?php 
+                  
+                  $sql = mysqli_query($mysqli,"SELECT * FROM accounts"); 
+                  while($row = mysqli_fetch_array($sql)){
+                    $account_id = $row['account_id'];
+                    $account_name = $row['account_name'];
+                  ?>
+                    <option value="<?php echo $account_id; ?>"><?php echo "$account_name"; ?></option>
+                  
+                  <?php
+                  }
+                  ?>
+                </select>
+              </div>
+            </div>
+            <div class="form-group col">
+              <label>Payment Method</label>
+              <div class="input-group"> 
+                <div class="input-group-prepend">
+                  <span class="input-group-text"><i class="fa fa-university"></i></span>
+                </div> 
+                <select class="form-control" name="payment_method" required>
+                  <option value="">- Payment Method -</option>
+                  <?php 
+                  
+                  $sql = mysqli_query($mysqli,"SELECT * FROM categories WHERE category_type = 'Payment Method'"); 
+                  while($row = mysqli_fetch_array($sql)){
+                    $category_id = $row['category_id'];
+                    $category_name = $row['category_name'];
+                  ?>
+                    <option value="<?php echo $category_id; ?>"><?php echo "$category_name"; ?></option>
+                  
+                  <?php
+                  }
+                  ?>
+                </select>
+              </div>
+            </div>
+          </div>
+        </div>
+        <div class="modal-footer">
+          <button type="button" class="btn btn-secondary" data-dismiss="modal">Cancel</button>
+          <button type="submit" name="add_invoice_payment" class="btn btn-primary">Save</button>
+        </div>
+      </form>
+    </div>
+  </div>
+</div>

categories.php

@@ -35,7 +35,7 @@
                   <i class="fas fa-ellipsis-h"></i>
                 </button>
                 <div class="dropdown-menu" aria-labelledby="dropdownMenuButton">
-                  <a class="dropdown-item" href="#" data-toggle="modal" data-target="#editcategoryModal<?php echo $category_id; ?>">Edit</a>
+                  <a class="dropdown-item" href="#" data-toggle="modal" data-target="#editCategoryModal<?php echo $category_id; ?>">Edit</a>
                   <a class="dropdown-item" href="#">Delete</a>
                 </div>
               </div>      

config.php

@@ -82,7 +82,8 @@
 
 	$category_types_array = array(
 		'Expense',
-		'Income'
+		'Income',
+		'Payment Method'
 	);
 
 ?>

edit_category.php

@@ -0,0 +1,32 @@
+<div class="modal fade" id="editCategoryModal<?php echo $category_id; ?>" tabindex="-1">
+  <div class="modal-dialog">
+    <div class="modal-content">
+      <div class="modal-header">
+        <h5 class="modal-title"><i class="fa fa-modify"></i> Modify Category</h5>
+        <button type="button" class="close" data-dismiss="modal">
+          <span aria-hidden="true">&times;</span>
+        </button>
+      </div>
+      <form action="post.php" method="post" autocomplete="off">
+        <div class="modal-body">
+          <div class="form-group">
+            <label>Name</label>
+            <input type="text" class="form-control" name="name" value="<?php echo $category_name; ?>" required>
+          </div>
+          <div class="form-group">
+            <label>Type</label>
+            <select class="form-control" name="type" required>
+              <?php foreach($category_types_array as $category_type => $category_type) { ?>
+              <option <?php if($category_type == $category_type) { echo "selected"; } ?>><?php echo $category_type; ?></option>
+              <?php } ?>
+            </select>
+          </div>
+        </div>
+        <div class="modal-footer">
+          <button type="button" class="btn btn-secondary" data-dismiss="modal">Cancel</button>
+          <button type="submit" name="add_category" class="btn btn-primary">Save</button>
+        </div>
+      </form>
+    </div>
+  </div>
+</div>

edit_category_modal.php

@@ -0,0 +1,32 @@
+<div class="modal fade" id="editCategoryModal<?php echo $category_id; ?>" tabindex="-1">
+  <div class="modal-dialog">
+    <div class="modal-content">
+      <div class="modal-header">
+        <h5 class="modal-title"><i class="fa fa-modify"></i> Modify Category</h5>
+        <button type="button" class="close" data-dismiss="modal">
+          <span aria-hidden="true">&times;</span>
+        </button>
+      </div>
+      <form action="post.php" method="post" autocomplete="off">
+        <div class="modal-body">
+          <div class="form-group">
+            <label>Name</label>
+            <input type="text" class="form-control" name="name" value="<?php echo $category_name; ?>" required>
+          </div>
+          <div class="form-group">
+            <label>Type</label>
+            <select class="form-control" name="type" required>
+              <?php foreach($category_types_array as $category_type2 => $category_type2) { ?>
+              <option <?php if($category_type == $category_type2) { echo "selected"; } ?>><?php echo $category_type2; ?></option>
+              <?php } ?>
+            </select>
+          </div>
+        </div>
+        <div class="modal-footer">
+          <button type="button" class="btn btn-secondary" data-dismiss="modal">Cancel</button>
+          <button type="submit" name="add_category" class="btn btn-primary">Save</button>
+        </div>
+      </form>
+    </div>
+  </div>
+</div>

invoice.php

@@ -20,7 +20,12 @@ if(isset($_GET['invoice_id'])){
   $invoice_status = $row['invoice_status'];
   $invoice_date = $row['invoice_date'];
   $invoice_due = $row['invoice_due'];
-  $invoice_amount = $row['invoice_amount'];
+  $invoice_subtotal = $row['invoice_subtotal'];
+  $invoice_discount = $row['invoice_discount'];
+  $invoice_tax = $row['invoice_tax'];
+  $invoice_total = $row['invoice_total'];
+  $invoice_paid = $row['invoice_paid'];
+  $invoice_balance = $row['invoice_balance'];
   $client_id = $row['client_id'];
   $client_name = $row['client_name'];
   $client_address = $row['client_address'];
@@ -34,6 +39,9 @@ if(isset($_GET['invoice_id'])){
   }
   $client_website = $row['client_website'];
 
+  $sql2 = mysqli_query($mysqli,"SELECT * FROM invoice_history WHERE invoice_id = $invoice_id ORDER BY invoice_history_id DESC");
+  $sql3 = mysqli_query($mysqli,"SELECT * FROM invoice_payments, accounts WHERE invoice_payments.account_id = accounts.account_id AND invoice_payments.invoice_id = $invoice_id ORDER BY invoice_payments.invoice_payment_id DESC");
+
 ?>
 <div class="row">
   <div class="col-md-11">
@@ -51,7 +59,7 @@ if(isset($_GET['invoice_id'])){
         <a class="dropdown-item" href="#" data-toggle="modal" data-target="#editinvoiceModal<?php echo $invoice_id; ?>">Edit</a>
         <a class="dropdown-item" href="#" data-toggle="modal" data-target="#addinvoiceCopyModal<?php echo $invoice_id; ?>">Copy</a>
         <a class="dropdown-item" href="#" data-toggle="modal" data-target="#addinvoiceCopyModal<?php echo $invoice_id; ?>">Send Email</a>
-        <a class="dropdown-item" href="#" data-toggle="modal" data-target="#addinvoiceCopyModal<?php echo $invoice_id; ?>">Add Payment</a>
+        <a class="dropdown-item" href="#" data-toggle="modal" data-target="#addInvoicePaymentModal">Add Payment</a>
         <a class="dropdown-item" href="#" data-toggle="modal" data-target="#addinvoiceCopyModal<?php echo $invoice_id; ?>">Print</a>
         <a class="dropdown-item" href="#">Delete</a>
       </div>
@@ -101,7 +109,7 @@ if(isset($_GET['invoice_id'])){
   </div>
 </div>
 
-<?php $sql2 = mysqli_query($mysqli,"SELECT * FROM invoice_items WHERE invoice_id = $invoice_id ORDER BY invoice_item_id DESC"); ?>
+<?php $sql4 = mysqli_query($mysqli,"SELECT * FROM invoice_items WHERE invoice_id = $invoice_id ORDER BY invoice_item_id ASC"); ?>
 
 <div class="row mb-3">
   <div class="col-md-12">
@@ -113,41 +121,38 @@ if(isset($_GET['invoice_id'])){
         <table class="table">
           <thead>
             <tr>
+              <th></th>
               <th>Product</th>
               <th>Description</th>
               <th class="text-center">Qty</th>
               <th class="text-right">Price</th>
               <th class="text-right">Tax</th>
               <th class="text-right">Total</th>
-              <th class="text-center"></th>
             </tr>
           </thead>
           <tbody>
             <?php
       
-            while($row = mysqli_fetch_array($sql2)){
+            while($row = mysqli_fetch_array($sql4)){
               $invoice_item_id = $row['invoice_item_id'];
               $invoice_item_name = $row['invoice_item_name'];
               $invoice_item_description = $row['invoice_item_description'];
               $invoice_item_quantity = $row['invoice_item_quantity'];
               $invoice_item_price = $row['invoice_item_price'];
+              $invoice_item_subtotal = $row['invoice_item_price'];
               $invoice_item_tax = $row['invoice_item_tax'];
               $invoice_item_total = $row['invoice_item_total'];
 
-              $invoice_subtotal = $invoice_subtotal + $invoice_item_price * $invoice_item_quantity;
-              $invoice_tax = $invoice_tax + $invoice_item_tax;
-              $invoice_total = $invoice_total + $invoice_item_total;
-
             ?>
 
             <tr>
+              <td class="text-center"><a class="btn btn-danger btn-sm" href="post.php?delete_invoice_item=<?php echo $invoice_item_id; ?>"><i class="fa fa-trash"></i></a></td>
               <td><?php echo $invoice_item_name; ?></td>
               <td><?php echo $invoice_item_description; ?></td>
               <td class="text-center"><?php echo $invoice_item_quantity; ?></td>
               <td class="text-right"><?php echo "$ $invoice_item_price"; ?></td>
               <td class="text-right"><?php echo "$ $invoice_item_tax"; ?></td>
               <td class="text-right"><?php echo "$ $invoice_item_total"; ?></td>  
-              <td class="text-center"><a class="btn btn-danger btn-sm" href="post.php?delete_invoice_item=<?php echo $invoice_item_id; ?>"><i class="fa fa-trash"></i></a></td>
             </tr>
 
             <?php 
@@ -158,6 +163,7 @@ if(isset($_GET['invoice_id'])){
 
             <tr>
               <form action="post.php" method="post">
+                <td class="text-center"><button type="submit" class="btn btn-primary btn-sm" name="add_invoice_item"><i class="fa fa-check"></i></button></td>
                 <input type="hidden" name="invoice_id" value="<?php echo $invoice_id; ?>">
                 <td><input type="text" class="form-control" name="name"></td>
                 <td><textarea class="form-control" rows="1" name="description"></textarea></td>
@@ -170,26 +176,27 @@ if(isset($_GET['invoice_id'])){
                   </select>
                 </td>
                 <td class="text-right">$ 0.00</td>  
-                <td class="text-center"><button type="submit" class="btn btn-primary btn-sm" name="add_invoice_item"><i class="fa fa-check"></i></button></td>
               </form>
             </tr>
             <tr>
-              <td colspan="4"></td>
+              <td colspan="5"></td>
               <td><strong>SubTotal</strong></td>
               <td class="text-right">$<?php echo $invoice_subtotal; ?></td>
-              <td></td>
             </tr>
             <tr>
-              <td colspan="4"></td>
+              <td colspan="5"></td>
+              <td><strong>Discount</strong></td>
+              <td class="text-right">$<?php echo $invoice_discount; ?></td>             
+            </tr>
+            <tr>
+              <td colspan="5"></td>
               <td><strong>Tax</strong></td>
               <td class="text-right">$<?php echo $invoice_tax; ?></td>        
-              <td></td>
             </tr>
             <tr>
-              <td colspan="4"></td>
+              <td colspan="5"></td>
               <td><strong>Total</strong></td>
               <td class="text-right">$<?php echo $invoice_total; ?></td>
-              <td></td>
             </tr>
           </tbody>
         </table>   
@@ -246,6 +253,23 @@ if(isset($_GET['invoice_id'])){
             </tr>
           </thead>
           <tbody>
+            <?php
+      
+            while($row = mysqli_fetch_array($sql2)){
+              $invoice_history_date = $row['invoice_history_date'];
+              $invoice_history_status = $row['invoice_history_status'];
+              $invoice_history_description = $row['invoice_history_description'];
+             
+            ?>
+            <tr>
+              <td><?php echo $invoice_history_date; ?></td>
+              <td><?php echo $invoice_history_status; ?></td>
+              <td><?php echo $invoice_history_description; ?></td>
+            </tr>
+            <?php
+            }
+            ?>
+
           </tbody>
         </table>
       </div>
@@ -267,6 +291,25 @@ if(isset($_GET['invoice_id'])){
             </tr>
           </thead>
           <tbody>
+            <?php
+      
+            while($row = mysqli_fetch_array($sql3)){
+              $invoice_payment_id = $row['invoice_payment_id'];
+              $invoice_payment_date = $row['invoice_payment_date'];
+              $invoice_payment_amount = $row['invoice_payment_amount'];
+              $account_name = $row['account_name'];
+
+             
+            ?>
+            <tr>
+              <td><?php echo $invoice_payment_date; ?></td>
+              <td><?php echo $invoice_payment_amount; ?></td>
+              <td><?php echo $account_name; ?></td>
+              <td class="text-center"><a class="btn btn-danger btn-sm" href="post.php?delete_invoice_payment=<?php echo $invoice_payment_id; ?>"><i class="fa fa-trash"></i></a></td>
+            </tr>
+            <?php
+            }
+            ?>
           </tbody>
         </table>
       </div>
@@ -274,6 +317,8 @@ if(isset($_GET['invoice_id'])){
   </div>
 </div>
 
+<?php include("add_invoice_payment_modal.php"); ?>
+
 <?php } ?>
 
 <?php include("footer.php");

invoices.php

@@ -35,7 +35,7 @@
             $invoice_status = $row['invoice_status'];
             $invoice_date = $row['invoice_date'];
             $invoice_due = $row['invoice_due'];
-            $invoice_amount = $row['invoice_amount'];
+            $invoice_balance = $row['invoice_balance'];
             $client_id = $row['client_id'];
             $client_name = $row['client_name'];
 
@@ -44,7 +44,7 @@
           <tr>
             <td><a href="invoice.php?invoice_id=<?php echo $invoice_id; ?>">INV-<?php echo "$invoice_number"; ?></a></td>
             <td><a href="client.php?client_id=<?php echo $client_id; ?>"><?php echo "$client_name"; ?></a></td>
-            <td class="text-right text-monospace">$<?php echo "$invoice_amount"; ?></td>
+            <td class="text-right text-monospace">$<?php echo "$invoice_balance"; ?></td>
             <td><?php echo "$invoice_date"; ?></td>
             <td><?php echo "$invoice_due"; ?></td>
             <td><?php echo "$invoice_status"; ?></td>

post.php

@@ -268,13 +268,25 @@ if(isset($_POST['add_invoice_item'])){
     $price = $_POST['price'];
     $tax = $_POST['tax'];
     
-    $sub_total = $price * $qty;
+    $subtotal = $price * $qty;
-    $tax = $sub_total * $tax;
+    $tax = $subtotal * $tax;
-    $total = $sub_total + $tax;
+    $total = $subtotal + $tax;
 
-    mysqli_query($mysqli,"INSERT INTO invoice_items SET invoice_item_name = '$name', invoice_item_description = '$description', invoice_item_quantity = $qty, invoice_item_price = '$price', invoice_item_tax = '$tax', invoice_item_total = '$total', invoice_id = $invoice_id");
+    mysqli_query($mysqli,"INSERT INTO invoice_items SET invoice_item_name = '$name', invoice_item_description = '$description', invoice_item_quantity = $qty, invoice_item_price = '$price', invoice_item_subtotal = '$subtotal', invoice_item_tax = '$tax', invoice_item_total = '$total', invoice_id = $invoice_id");
 
-    $_SESSION['alert_message'] = "Invoice added";
+    //Update Invoice Balances
+
+    $sql = mysqli_query($mysqli,"SELECT * FROM invoices WHERE invoice_id = $invoice_id");
+    $row = mysqli_fetch_array($sql);
+
+    $invoice_subtotal = $row['invoice_subtotal'] + $subtotal;
+    $invoice_tax = $row['invoice_tax'] + $tax; 
+    $invoice_total = $row['invoice_total'] + $total;
+    $invoice_balance = $row['invoice_balance'] + $total;
+
+    mysqli_query($mysqli,"UPDATE invoices SET invoice_subtotal = '$invoice_subtotal', invoice_tax = '$invoice_tax', invoice_total = '$invoice_total', invoice_balance = '$invoice_balance' WHERE invoice_id = $invoice_id");
+
+    $_SESSION['alert_message'] = "Item added";
     
     header("Location: " . $_SERVER["HTTP_REFERER"]);
 
@@ -283,6 +295,22 @@ if(isset($_POST['add_invoice_item'])){
 if(isset($_GET['delete_invoice_item'])){
     $invoice_item_id = intval($_GET['delete_invoice_item']);
 
+    $sql = mysqli_query($mysqli,"SELECT * FROM invoice_items WHERE invoice_item_id = $invoice_item_id");
+    $row = mysqli_fetch_array($sql);
+    $invoice_id = $row['invoice_id'];
+    $invoice_item_subtotal = $row['invoice_item_subtotal'];
+    $invoice_item_tax = $row['invoice_item_tax'];
+    $invoice_item_total = $row['invoice_item_total'];
+
+    $sql = mysqli_query($mysqli,"SELECT * FROM invoices WHERE invoice_id = $invoice_id");
+    $row = mysqli_fetch_array($sql);
+    $invoice_balance = $row['invoice_balance'] - $invoice_item_total;
+    $invoice_subtotal = $row['invoice_subtotal'] - $invoice_item_subtotal;
+    $invoice_tax = $row['invoice_tax'] - $invoice_item_tax;
+    $invoice_total = $row['invoice_total'] - $invoice_item_total;
+
+    mysqli_query($mysqli,"UPDATE invoices SET invoice_subtotal = '$invoice_subtotal', invoice_tax = '$invoice_tax', invoice_total = '$invoice_total', invoice_balance = '$invoice_balance' WHERE invoice_id = $invoice_id");
+
     mysqli_query($mysqli,"DELETE FROM invoice_items WHERE invoice_item_id = $invoice_item_id");
 
     $_SESSION['alert_message'] = "Item deleted";
@@ -291,6 +319,49 @@ if(isset($_GET['delete_invoice_item'])){
   
 }
 
+if(isset($_POST['add_invoice_payment'])){
+
+    $invoice_id = intval($_POST['invoice_id']);
+    $date = strip_tags(mysqli_real_escape_string($mysqli,$_POST['date']));
+    $amount = $_POST['amount'];
+    $account = intval($_POST['account']);
+    $payment_method = strip_tags(mysqli_real_escape_string($mysqli,$_POST['payment_method']));
+
+    $sql = mysqli_query($mysqli,"SELECT * FROM invoices WHERE invoice_id = $invoice_id");
+    $row = mysqli_fetch_array($sql);
+    $invoice_balance = $row['invoice_balance'] - $amount;
+    $invoice_paid = $row['invoice_paid'] + $paid;
+
+    mysqli_query($mysqli,"UPDATE invoices SET invoice_balance = '$invoice_balance', invoice_paid = '$invoice_paid' WHERE invoice_id = $invoice_id");
+
+    mysqli_query($mysqli,"INSERT INTO invoice_payments SET invoice_payment_date = '$date', invoice_payment_amount = '$amount', account_id = $account, invoice_payment_method = '$payment_method', invoice_id = $invoice_id");
+
+    $_SESSION['alert_message'] = "Payment added";
+    
+    header("Location: " . $_SERVER["HTTP_REFERER"]);
+
+}
+
+if(isset($_GET['delete_invoice_payment'])){
+    $invoice_payment_id = intval($_GET['delete_invoice_payment']);
+
+    $sql = mysqli_query($mysqli,"SELECT * FROM invoice_payments WHERE invoice_payment_id = $invoice_id");
+    $row = mysqli_fetch_array($sql);
+    $invoice_id = $row['invoice_id'];
+    $invoice_payment_amount = $row['invoice_payment_amount'];
+
+    $invoice_balance = $row['invoice_balance'] - $invoice_payment_amount;
+
+    mysqli_query($mysqli,"UPDATE invoices SET invoice_balance = '$invoice_balance' WHERE invoice_id = $invoice_id");
+
+    mysqli_query($mysqli,"DELETE FROM invoice_payments WHERE invoice_payment_id = $invoice_payment_id");
+
+    $_SESSION['alert_message'] = "Payment deleted";
+    
+    header("Location: " . $_SERVER["HTTP_REFERER"]);
+  
+}
+
 if(isset($_POST['add_user'])){
     $email = strip_tags(mysqli_real_escape_string($mysqli,$_POST['email']));
     $password = mysqli_real_escape_string($mysqli,$_POST['password']);