Stripe webhook error fails on wordpress theme - php

Question

I am trying to solve a problem, I am currently doing tests with stripe where the user pays for a small percentage of a reservation, this payment is reflected in my stripe account (test) and everything is in order. The problem is that there is an event that fails and it is retried to send from webhook, when this event is retried to send it causes me on the web page to be marked as fully paid, the ideal would be that this event always comes out as successful or that it does not return to try, hope there is a solution.
This is the code from the theme when the function take place of payment_intent.succeeded:
$endpoint_secret = esc_html ( wprentals_get_option('wp_estate_stripe_webhook','') );
$payload = #file_get_contents('php://input');
$sig_header = $_SERVER['HTTP_STRIPE_SIGNATURE'];
$event = null;
try {
$event = \Stripe\Webhook::constructEvent(
$payload, $sig_header, $endpoint_secret
);
} catch(\UnexpectedValueException $e) {
// Invalid payload
http_response_code(400); // PHP 5.4 or greater
exit('');
} catch(\Stripe\Error\SignatureVerification $e) {
// Invalid signature
http_response_code(400); // PHP 5.4 or greater
exit();
}
if ($event->type == "payment_intent.succeeded") {
$intent = $event->data->object;
$pay_type = intval($event->data->object->charges->data[0]->metadata->pay_type);
$userId = intval($event->data->object->charges->data[0]->metadata->user_id);
$depozit = intval($intent->amount);
if($pay_type==1){
$invoice_id = intval($event->data->object->charges->data[0]->metadata->invoice_id);
$booking_id = intval($event->data->object->charges->data[0]->metadata->booking_id );
$is_stripe=1;
wpestate_booking_mark_confirmed($booking_id,$invoice_id,$userId,$depozit,$user_email,$is_stripe);
$redirect=wpestate_get_template_link('user_dashboard_my_reservations.php');
http_response_code(200);
wp_redirect($redirect);exit();
}else if($pay_type==2){
$listing_id = intval($event->data->object->charges->data[0]->metadata->listing_id);
$is_featured = intval($event->data->object->charges->data[0]->metadata->featured_pay);
$is_upgrade = intval($event->data->object->charges->data[0]->metadata->is_upgrade);
$time = time();
$date = date('Y-m-d H:i:s',$time);
if($is_upgrade==1){
update_post_meta($listing_id, 'prop_featured', 1);
$invoice_id = wpestate_insert_invoice('Upgrade to Featured','One Time',$listing_id,$date,$current_user->ID,0,1,'' );
update_post_meta($invoice_id, 'invoice_status', 'confirmed');
wpestate_email_to_admin(1);
}else{
update_post_meta($listing_id, 'pay_status', 'paid');
$admin_submission_status = esc_html ( wprentals_get_option('wp_estate_admin_submission','') );
$paid_submission_status = esc_html ( wprentals_get_option('wp_estate_paid_submission','') );
if($admin_submission_status=='no' && $paid_submission_status=='per listing' ){
$post = array(
'ID' => $listing_id,
'post_status' => 'publish'
);
$post_id = wp_update_post($post );
}
// end make post publish
if($is_featured==1){
update_post_meta($listing_id, 'prop_featured', 1);
$invoice_id = wpestate_insert_invoice('Publish Listing with Featured','One Time',$listing_id,$date,$current_user->ID,1,0,'' );
update_post_meta($invoice_id, 'invoice_status', 'confirmed');
}else{
$invoice_id = wpestate_insert_invoice('Listing','One Time',$listing_id,$date,$current_user->ID,0,0,'' );
update_post_meta($invoice_id, 'invoice_status', 'confirmed');
}
wpestate_email_to_admin(0);
}
$redirect = wpestate_get_template_link('user_dashboard.php');
http_response_code(200);
wp_redirect($redirect);exit();
}