diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index d71f0d7..775ea58 100755
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -30,15 +30,12 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        php: ['8.0', '8.1']
-        moodle-branch: ['MOODLE_401_STABLE', 'MOODLE_402_STABLE', 'MOODLE_403_STABLE', 'master']
+        php: ['8.1']
+        moodle-branch: ['MOODLE_401_STABLE', 'MOODLE_402_STABLE', 'MOODLE_403_STABLE']
         database: ['mariadb', 'pgsql']
         include:
-          - php: '7.4'
-            moodle-branch: 'MOODLE_401_STABLE'
-            database: 'pgsql'
           - php: '8.2'
-            moodle-branch: 'MOODLE_403_STABLE'
+            moodle-branch: 'main'
             database: 'pgsql'
 
     steps:
diff --git a/classes/reportbuilder/local/entities/payment.php b/classes/reportbuilder/local/entities/payment.php
index e6cd552..30883f3 100755
--- a/classes/reportbuilder/local/entities/payment.php
+++ b/classes/reportbuilder/local/entities/payment.php
@@ -117,7 +117,13 @@ protected function get_all_columns(): array {
             ->set_type(column::TYPE_TEXT)
             ->add_field("{$tablealias}.amount")
             ->set_is_sortable(true)
-            ->add_attributes(['class' => 'text-right']);
+            ->add_callback(function(?string $value): string {
+                if ($value === '') {
+                    return '0';
+                }
+                $floa = floatval($value);
+                return number_format($floa, 2);
+            });
 
         // Currency column.
         $columns[] = (new column('currency', new lang_string('currency'), $name))
diff --git a/tests/event/event_test.php b/tests/event/event_test.php
index aaaf5e4..f147a15 100755
--- a/tests/event/event_test.php
+++ b/tests/event/event_test.php
@@ -50,7 +50,7 @@ public function setUp(): void {
      * simply create the event and trigger it.
      * @covers \report_payments\event\report_viewed
      */
-    public function test_report_viewed() {
+    public function test_report_viewed(): void {
         $course = $this->getDataGenerator()->create_course();
         $user = $this->getDataGenerator()->create_user();
 
@@ -111,7 +111,7 @@ public function test_report_viewed() {
      * Tests the report navigation as an admin.
      * @coversNothing
      */
-    public function test_report_payments_navigation() {
+    public function test_report_payments_navigation(): void {
         global $CFG, $PAGE, $USER;
         require_once($CFG->dirroot . '/report/payments/lib.php');
         $course = $this->getDataGenerator()->create_course();
@@ -138,7 +138,7 @@ public function test_report_payments_navigation() {
      * Tests the report page type list.
      * @coversNothing
      */
-    public function test_report_payments_page_type() {
+    public function test_report_payments_page_type(): void {
         global $CFG, $PAGE;
         $course = $this->getDataGenerator()->create_course();
         $PAGE->set_url('/course/view.php', ['id' => $course->id]);
diff --git a/tests/privacy/privacy_test.php b/tests/privacy/privacy_test.php
index f833a61..de08fad 100755
--- a/tests/privacy/privacy_test.php
+++ b/tests/privacy/privacy_test.php
@@ -39,7 +39,7 @@ class privacy_test extends provider_testcase {
      * Test returning metadata.
      * @covers \report_payments\privacy\provider
      */
-    public function test_get_metadata() {
+    public function test_get_metadata(): void {
         $str = 'report_payments';
         $this->resetAfterTest(true);
         $collection = new \core_privacy\local\metadata\collection($str);
diff --git a/tests/reportbuilder/reports_test.php b/tests/reportbuilder/reports_test.php
index 978276b..f7f2574 100755
--- a/tests/reportbuilder/reports_test.php
+++ b/tests/reportbuilder/reports_test.php
@@ -85,7 +85,7 @@ public function setUp(): void {
      * @covers \report_payments\reportbuilder\local\systemreports\payments_global
      * @covers \report_payments\reportbuilder\local\entities\payment
      */
-    public function test_global() {
+    public function test_global(): void {
         $context = \context_system::instance();
         $report = system_report_factory::create(payments_global::class, $context);
         $this->assertEquals($report->get_name(), 'Payments');
@@ -100,7 +100,7 @@ public function test_global() {
      * @covers \report_payments\reportbuilder\local\systemreports\payments_course
      * @covers \report_payments\reportbuilder\local\entities\payment
      */
-    public function test_course() {
+    public function test_course(): void {
         $report = system_report_factory::create(payments_course::class, \context_course::instance($this->course->id));
         $this->assertEquals($report->get_name(), 'Payments');
     }
@@ -111,7 +111,7 @@ public function test_course() {
      * @covers \report_payments\reportbuilder\local\systemreports\payments_user
      * @covers \report_payments\reportbuilder\local\entities\payment
      */
-    public function test_user() {
+    public function test_user(): void {
         $report = system_report_factory::create(payments_user::class, \context_user::instance($this->userid));
         $this->assertEquals($report->get_name(), 'Payments');
     }
@@ -122,7 +122,7 @@ public function test_user() {
      * @covers \report_payments\reportbuilder\datasource\payments
      * @covers \report_payments\reportbuilder\local\entities\payment
      */
-    public function test_datasource() {
+    public function test_datasource(): void {
         $gen = self::getDataGenerator()->get_plugin_generator('core_reportbuilder');
         $report = $gen->create_report(['name' => 'Pay', 'source' => payments::class, 'default' => true]);
         $this->assertEquals($report->get_formatted_name(), 'Pay');