started work on OTP and disabled registration

app/Mail/LoginOtpMail.php

@@ -0,0 +1,25 @@
+<?php
+
+namespace App\Mail;
+
+use Illuminate\Bus\Queueable;
+use Illuminate\Mail\Mailable;
+use Illuminate\Queue\SerializesModels;
+
+class LoginOtpMail extends Mailable
+{
+    use Queueable, SerializesModels;
+
+    public $otp;
+
+    public function __construct($otp)
+    {
+        $this->otp = $otp;
+    }
+
+    public function build()
+    {
+        return $this->subject('Your Login Verification Code')
+                    ->markdown('emails.auth.otp');
+    }
+}