diff --git a/app/Services/Invoice/InvoiceAllStudentsPay.php b/app/Services/Invoice/InvoiceAllStudentsPay.php
new file mode 100644
index 0000000..14adc18
--- /dev/null
+++ b/app/Services/Invoice/InvoiceAllStudentsPay.php
@@ -0,0 +1,47 @@
+<?php
+
+namespace App\Services\Invoice;
+
+use App\Models\School;
+
+use function auditionSetting;
+
+class InvoiceAllStudentsPay implements InvoiceDataService
+{
+    /**
+     * Create a new class instance.
+     */
+    public function __construct()
+    {
+        //
+    }
+
+    public function getLines(School $school)
+    {
+        // TODO: Implement getLines() method.
+    }
+
+    public function getLinesTotal(School $school)
+    {
+        // TODO: Implement getLinesTotal() method.
+    }
+
+    public function getLateFeesTotal(School $school)
+    {
+        // TODO: Implement getLateFeesTotal() method.
+    }
+
+    public function getSchoolFeeTotal(School $school)
+    {
+        if (! auditionSetting('school_fee')) {
+            return 0;
+        }
+        return auditionSetting('school_fee');
+
+    }
+
+    public function getGrandTotal(School $school)
+    {
+        // TODO: Implement getGrandTotal() method.
+    }
+}
diff --git a/app/Services/Invoice/InvoiceDataService.php b/app/Services/Invoice/InvoiceDataService.php
new file mode 100644
index 0000000..02e298f
--- /dev/null
+++ b/app/Services/Invoice/InvoiceDataService.php
@@ -0,0 +1,18 @@
+<?php
+
+namespace App\Services\Invoice;
+
+use App\Models\School;
+
+interface InvoiceDataService
+{
+    public function getLines(School $school);
+
+    public function getLinesTotal(School $school);
+
+    public function getLateFeesTotal(School $school);
+
+    public function getSchoolFeeTotal(School $school);
+
+    public function getGrandTotal(School $school);
+}