PHP Website Repairs Needed

Job ID: 36077081

Budget: $10 – $30 USD

I have a php website, where customers can place an order and pay using PayPal.
Few changes happened about 2 weeks ago and need repairs:

1 - When the customer pays, the orders stay in the shopping cart. Previously, when the customer pays, the orders will be removed from the shopping cart.

2 - the websites used to send me notification with the details of the order. Now, the website do not send theses notifications

3 – PayPal sent me the following message:
“ Please check your server that handles PayPal Instant Payment Notifications (IPN). IPNs sent to the following URL(s) are failing: http://My-Website.com/ipn.php
If you do not recognize this URL, you may be using a service provider that is using IPN on your behalf. Please contact your service provider with the above information. If this problem continues, IPNs may be disabled for your account. “

Please apply ONLY If you have extensive experience in this type of web repairs.
Related categories: PHP Website Testing MySQL HTML Web Hosting