diff --git a/src/app/Http/Controllers/API/V4/PaymentsController.php b/src/app/Http/Controllers/API/V4/PaymentsController.php
--- a/src/app/Http/Controllers/API/V4/PaymentsController.php
+++ b/src/app/Http/Controllers/API/V4/PaymentsController.php
@@ -156,7 +156,7 @@
         // TODO: allow comma as a decimal point?
 
         if ($v->fails()) {
-            return $v->errors();
+            return $v->errors()->toArray();
         }
 
         $amount = (int) ($request->amount * 100);
diff --git a/src/app/OpenVidu/Room.php b/src/app/OpenVidu/Room.php
--- a/src/app/OpenVidu/Room.php
+++ b/src/app/OpenVidu/Room.php
@@ -170,24 +170,32 @@
      * Create a OpenVidu session (connection) token
      *
      * @return array|null Token data on success, NULL otherwise
+     * @throws \Exception if session does not exist
      */
     public function getSessionToken($role = self::ROLE_PUBLISHER): ?array
     {
-        $response = $this->client()->request(
-            'POST',
-            'tokens',
-            [
-                'json' => [
-                    'session' => $this->session_id,
-                    'role' => $role
-                ]
+        if (!$this->session_id) {
+            throw new \Exception("The room session does not exist");
+        }
+
+        $url = 'sessions/' . $this->session_id . '/connection';
+        $post = [
+            'json' => [
+                'role' => $role
             ]
-        );
+        ];
+
+        $response = $this->client()->request('POST', $url, $post);
 
         if ($response->getStatusCode() == 200) {
             $json = json_decode($response->getBody(), true);
 
-            return $json;
+            return [
+                'session' => $this->session_id,
+                'token' => $json['token'],
+                'role' => $json['role'],
+                'connectionId' => $json['id'],
+            ];
         }
 
         return null;
diff --git a/src/app/Providers/Payment/Stripe.php b/src/app/Providers/Payment/Stripe.php
--- a/src/app/Providers/Payment/Stripe.php
+++ b/src/app/Providers/Payment/Stripe.php
@@ -357,7 +357,7 @@
 
                 if ($status == self::STATUS_PAID) {
                     $payment->wallet->setSetting('stripe_mandate_id', $intent->id);
-                    $threshold = intval($payment->wallet->getSetting('mandate_balance') * 100);
+                    $threshold = intval((float) $payment->wallet->getSetting('mandate_balance') * 100);
 
                     // Top-up the wallet if balance is below the threshold
                     if ($payment->wallet->balance < $threshold && $payment->status != self::STATUS_PAID) {