Paypal displaying 400 error when copoun is applied - laravel

Question

I am using paypal integration in my web application everything is working fine . Checkout is working properly but when i apply the coupon then the paypal throws the exception of 400 error. Below is my code
I am using the daryldecode/cart for the checkout. The only problem is when I apply the coupon and move forward towards the paypal
public function paywithPaypal(Request $request)
{
// dd($request->all());
if(Auth::guest()){
if(Session::has('user_id')){
$sessionUserId = Session::get('user_id');
echo $sessionUserId;
}
$checkEmail= User::where('email',$request->billing_email )->first();
if(empty($checkEmail)) {
$user = User::create( [
'first_name' => $request->billing_first_name,
'last_name' => $request->billing_last_name,
'email' => $request->billing_email,
'username' => $request->billing_first_name,
'password' => bcrypt( 123456 ),
'province' => $request->billing_state,
'city' => $request->billing_town,
'address' => $request->billing_address_1,
'role' => 'Member',
] );
$userId = $user->id;
}else{
$userId = $checkEmail->id;
}
}else{
//user login
$sessionUserId = $userId = Auth::user()->id;
}
$items = [];
\Cart::session($sessionUserId)->getContent()->each(function($item) use (&$items)
{
$items[] = $item;
});
$subtotal = \Cart::session($sessionUserId)->getSubTotal();
// dd($subtotal);
$line1 = $request->billing_address_1;
$line2 = $request->billing_address_2;
$fullname = $request->billing_first_name ." ". $request->billing_last_name;
$state = $request->billing_state;
$zip = $request->billing_zip;
$phone = $request->billing_phone;
$email = $request->billing_email;
$city = $request->billing_town;
//invoke new order
$order = new Orders ;
$order->id = $order->generateID('INV');
$saved_order_id = $order->id;
$shippingAddress= Paypalpayment::shippingAddress();
$shippingAddress->setLine1($line1)
->setLine2($line2)
->setCity($city)
->setState($state)
->setPostalCode($zip)
->setCountryCode("US")
->setPhone($phone)
->setRecipientName($fullname);
// ### Payer
// A resource representing a Payer that funds a payment
// Use the List of `FundingInstrument` and the Payment Method
// as 'credit_card'
$payer = Paypalpayment::payer();
$payer->setPaymentMethod("paypal");
$listitem = array();
$fees=HandlingFee::find(1);
$fee = $fees->fee;
$shipping = $request->shipping_fee;
foreach($items as $key=>$item){
$listitem[$key] = Paypalpayment::item();
$listitem[$key]->setName($item->name)
->setCurrency('USD')
->setQuantity($item->quantity)
->setPrice($item->price);
$item_detail = new Order_Item_Details;
$item_detail->order_id = $saved_order_id;
$item_detail->item_id = $item->id;
$item_detail->qty = $item->quantity;
$item_detail->save();
}
$itemList = Paypalpayment::itemList();
$itemList->setItems($listitem)
->setShippingAddress($shippingAddress);
$details = Paypalpayment::details();
$details->setShipping($shipping)
->setHandlingFee($fee)
//total of items prices
->setSubtotal($subtotal);
$grandTotal = $subtotal + $fee + $shipping;
//dd($grandTotal);
//Payment Amount
$amount = Paypalpayment::amount();
$amount->setCurrency("USD")
// the total is $17.8 = (16 + 0.6) * 1 ( of quantity) + 1.2 ( of Shipping).
->setTotal($grandTotal)
->setDetails($details);
//dd($amount);
// ### Transaction
// A transaction defines the contract of a
// payment - what is the payment for and who
// is fulfilling it. Transaction is created with
// a `Payee` and `Amount` types
$transaction = Paypalpayment::transaction();
$transaction->setAmount($amount)
->setItemList($itemList)
->setDescription("Payment description")
->setInvoiceNumber($saved_order_id)
->setCustom($request->shipping_service);
// dd($transaction);
// ### Payment
// A Payment Resource; create one using
// the above types and intent as 'sale'
$redirectUrls = Paypalpayment::redirectUrls();
$redirectUrls->setReturnUrl(url("/payments/success"))
->setCancelUrl(url("/payments/fails"));
$payment = Paypalpayment::payment();
$payment->setIntent("sale")
->setPayer($payer)
->setRedirectUrls($redirectUrls)
->setTransactions([$transaction]);
$order->status = 1;
$order->user_id = $userId;
$order->total = $grandTotal;
$order->subtotal = $subtotal;
$order->shipping = $shipping;
if($request->coupon_code == ""){
$order->isCoupon = 0;
}
else{
$order->isCoupon = 1;
}
$order->isBillingDetail = 1;
if($request->shipping_first_name <> ""){
$order->isShippingDetail = 1;
}
if($request->has('order_notes')){
$order->notes = $request->order_notes;
}
$order->save();
$order_billing = new Order_Billing_Details;
$order_billing->order_id = $order->id;
$order_billing->first_name = $request->billing_first_name ;
$order_billing->last_name = $request->billing_last_name ;
$order_billing->company = $request->billing_company_name ;
$order_billing->address_line_1 = $line1;
$order_billing->address_line_2 = $line2;
$order_billing->state = $state;
$order_billing->city = $city;
$order_billing->postal_code = $zip;
$order_billing->email = $email;
$order_billing->phone = $phone;
$order_billing->save();
if($request->shipping_first_name <> ""){
$order_shipping = new Order_Shipping_Details;
$order_shipping->order_id = $order->id;
$order_shipping->first_name = $request->shipping_first_name ;
$order_shipping->last_name = $request->shipping_last_name ;
$order_shipping->company = $request->shipping_company_name ;
$order_shipping->address_line_1 = $request->shipping_address_1 ;
$order_shipping->address_line_2 = $request->shipping_address_2 ;
$order_shipping->state = $request->shipping_state ;
$order_shipping->city = $request->shipping_town ;
$order_shipping->postal_code = $request->shipping_zip ;
$order_shipping->email = $email ;
$order_shipping->phone = $request->shipping_phone ;
$order_shipping->save();
}
else{
$order_shipping = new Order_Shipping_Details;
$order_shipping->order_id = $order->id;
$order_shipping->first_name = $request->billing_first_name ;
$order_shipping->last_name = $request->billing_last_name ;
$order_shipping->company = $request->billing_company_name ;
$order_shipping->address_line_1 = $line1;
$order_shipping->address_line_2 = $line2;
$order_shipping->state = $state;
$order_shipping->city = $city;
$order_shipping->postal_code = $zip;
$order_shipping->email = $email;
$order_shipping->phone = $phone;
$order_shipping->save();
}
try {
// ### Create Payment
// Create a payment by posting to the APIService
// using a valid ApiContext
// The return object contains the status;
//dd(Paypalpayment::apiContext());
$payment->create(Paypalpayment::apiContext());
// dd($payment);
$arrpayment = $payment->toArray();
$order = Orders::find($saved_order_id);
$order->paypal_invoice = $arrpayment['id'];
$order->save();
} catch (\PPConnectionException $ex) {
echo $ex->getCode(); // Prints the Error Code
echo $ex->getData();
dd($ex);
return response()->json(["error" => $ex->getMessage()], 400);
}
catch (PayPal\Exception\PayPalConnectionException $ex) {
echo $ex->getCode(); // Prints the Error Code
echo $ex->getData(); // Prints the detailed error message
}
$email=$request->billing_email;
$fees=HandlingFee::find(1);
$fee = $fees->fee;
$data=array(
'order' => $order,
'name' => $request->billing_first_name.' '.$request->billing_last_name,
'email'=>$email,
'fee'=>$fee,
'payPalLink' => $payment->getApprovalLink(),
);
Mail::send('email.placed', $data, function($message) use ($email) {
$message->subject('New Order Received');
$message->from('no-reply#blurack.com', 'BluRack');
$message->to($email);
});
$admins=DB::table('users')
->select('updates_email')
->where('receiving_updates',1)
->where(function($q) {
$q->where('role','Administrator')
->orWhere('role','Retailer');
})->get()->toArray();
// ->where('role','Administrator')
// ->orWhere('role','Retailer')
// dd($admins);
foreach($admins as $admin){
$admin_mail=$admin->updates_email;
//dd($admin_mail);
Mail::send('email.orderplaced',$data, function($message) use ($admin_mail) {
$message->subject('New Order Received');
$message->from('no-reply#blurack.com', 'BluRack');
$message->to($admin_mail);
});
}
return redirect($payment->getApprovalLink());
// return response()->json([$payment->toArray(), 'approval_url' => $payment->getApprovalLink()],
200);
}
I think the issue is with try catch problem?