Integrate paymentwall payment system into my website

I have a budget of $30-50 I need to integrate paymentwall as a payment gateway to my website. You can read their integration documentation here>>[login to view URL] However, they need this these to be included for me to go live. So if you can do this, let me know: We're now able to do a transaction on your website. However, we see the following problems which are needed to be fixed in order to go live. 1. We see that the parameter history[registration_date] is missing in Checkout API call. 2. Upon checking your project settings, we see that you have not added a pingback url. Pingback url is a script which is called by Paymentwall upon successful completion of the transaction. Since the pingback url is not configured it is highly possible that user will never get the services they have requested for therefore, we request you to fix this problem by adding a pingback script 3. When we do Pay by Card, we are able to Pay for the order but the order status still shown as unpaid. Can you please explain here? 4. We need you to integrate Paymentwall's delivery confirmation API and return the below statuses upon different stages of the order. - order_placed - When the order is paid and accepted by your system - order_preparing - When the writer starts working on the essay - delivered - When the Order is delivered to the End User - consumed - When the user downloads/ reads the order. Following are some documentations for your reference in order to better integrate [login to view URL] [login to view URL] [login to view URL] [login to view URL] [login to view URL] Let us know once you have fixed the above issues so that we can continue with the review. Best Regards, Paymentwall Team.