SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'billing_email' cannot be null (SQL: insert into `orders

Am using flutterwave as my payment gateway, I want to save an order whenever customer finish making payment. But I can't get pass this error. I don't know what am missing. Thanks for your help. Here is my code.

public function initialize(Request  $request)
  {
    //This initializes payment and redirects to the payment gateway
    //The initialize method takes the parameter of the redirect URL
    Rave::initialize(route('callback'));
  }

When I dd($request->all()) in this initialize method I got all my data.

public function callback(Request  $request)
  {

    // $data = Rave::verifyTransaction(request()->txref);

    $resp = $request->resp;
    $body = json_decode($resp, true);
    $txRef = $body['data']['data']['txRef'];
    $data = Rave::verifyTransaction($txRef);
    
    // Insert into orders table 
    $order = Order::create([
      'user_id' => auth()->user() ? auth()->user()->id : null,
      'billing_email' => $request->email,
      'billing_first_name' => $request->first_name,
      'billing_last_name' => $request->last_name,
      'billing_address' => $request->address,
      'billing_city' => $request->city,
      'billing_town' => $request->town,
      'billing_postalcode' => $request->postalcode,
      'billing_phone' => $request->phone,
      'billing_total' => Cart::getTotal(),
      'error' => null,

    ]);

    foreach (Cart::getContent() as $item) 
    {
      OrderProduct::create([
        'order_id' => $order->id,
        'product_id' => $item->model->id,
        'quantity' => $item->quantity,
      ]);
    }

  }
}

But in this callback method I got null when I dd($data).

And this is my view.

<form method="POST" action="">
    @csrf
    
    <div class="form-group">
        <label for="email">Email Address</label>
        <input type="email" placeholder="Email address" name="email" class="form-control">
    </div>
    <div class="form-group">
       <label for="address">Address</label>
       <input type="text" placeholder="Delivery Address" name="address" class="form-control">
    </div>
    <div class="row">
        <div class="col">
            <div class="form-group">
                <label for="first_name">First Name</label>
                <input type="text" placeholder="First Name" name="first_name" class="form-control">
            </div>
        </div>
        <div class="col">
            <div class="form-group">
                <label for="second_name">Second Name</label>
                <input type="text" placeholder="Second Name" name="last_name" class="form-control">
            </div>
        </div>
    </div>
    <div class="row">
        <div class="col">
            <div class="form-group">
                <label for="city">City</label>
                <input type="text" placeholder="City" name="city" class="form-control">
            </div>
        </div>
        <div class="col">
            <div class="form-group">
                <label for="town">Town</label>
                <input type="text" placeholder="Town" name="town" class="form-control">
            </div>
        <div>
        </div>
            <div class="row">
                <div class="col">
                    <div class="form-group">
                        <label for="code">Postal\Zip Code</label>
                        <input type="text" placeholder="Postal or zip code" name="postalcode" class="form-control">
                    </div>
               </div>
               <div class="col">
                   <div class="form-group">
                       <label for="phone">Phone</label>
                       <input type="text" placeholder="Phone number" name="phone" class="form-control">
                   <div>
               </div>
          </div>
          
          <input type="hidden" name="currency" value="NGN" />
          <input type="hidden" name="country" value="NG" />
          <input type="hidden" name="amount" value="" />
          <input class="btn btn-success" type="submit" value="Proceed to buy"  />
</form>

I don't know what am missing.

via Chebli Mohamed