diff --git a/CRM/Civiquickbooks/Invoice.php b/CRM/Civiquickbooks/Invoice.php
index 09e50dc..e0a4ef0 100644
--- a/CRM/Civiquickbooks/Invoice.php
+++ b/CRM/Civiquickbooks/Invoice.php
@@ -650,6 +650,11 @@ protected function mapToAccounts($db_contribution, $accountsID, $SyncToken, $qb_
         'group_name' => 'Contribute Preferences',
       ]);
 
+      $invoice_prefix = civicrm_api3('Setting', 'getvalue', array(
+        'name' => "quickbooks_invoice_prefix",
+        'group' => 'QuickBooks Online Settings',
+      ));
+
       if (!empty($invoice_settings['due_date']) && !empty($invoice_settings['due_date_period'])) {
         $time_adjust_str = '+' . $invoice_settings['due_date'] . ' ' . $invoice_settings['due_date_period'];
       }
@@ -700,7 +705,7 @@ protected function mapToAccounts($db_contribution, $accountsID, $SyncToken, $qb_
       }
 
       if ($whereToGetInvoiceNumber == 'civi') {
-        $new_invoice['DocNumber'] = 'Civi-' . $db_contribution['id'];
+        $new_invoice['DocNumber'] = $invoice_prefix . sprintf("%07d", $db_contribution['id']);
       }
       elseif ($whereToGetInvoiceNumber == 'qb') {
         $new_invoice['AutoDocNumber'] = 1;
diff --git a/settings/civiquickbooks.setting.php b/settings/civiquickbooks.setting.php
index fdebfa8..1d87e5b 100644
--- a/settings/civiquickbooks.setting.php
+++ b/settings/civiquickbooks.setting.php
@@ -158,6 +158,23 @@
     ],
     'quick_form_type' => 'Element',
   ],
+  'quickbooks_invoice_prefix' => [
+    'group_name' => E::ts('QuickBooks Online Settings'),
+    'group' => 'civiquickbooks',
+    'name' => 'quickbooks_invoice_prefix',
+    'type' => 'String',
+    'default' => 'Civi-',
+    'title' => E::ts('Invoice Prefix'),
+    'is_domain' => 1,
+    'is_contact' => 0,
+    'description' => E::ts('Will be prefixed to Transaction ID when creating an invoices in QBO.'),
+    'help_text' => E::ts('Will be prefixed to Transaction ID when creating an invoice in QBO.'),
+    'html_type' => 'Text',
+    'html_attributes' => [
+      'size' => 10,
+    ],
+    'quick_form_type' => 'Element',
+  ],
   'quickbooks_log_dir' => [
     'group_name' => E::ts('QuickBooks Online Settings'),
     'group' => 'civiquickbooks',