web2008

Have you tried any of this? https://docs.whmcs.com/Maximising_Performance

https://docs.whmcs.com/PHP_Version_Support_Matrix https://docs.whmcs.com/MySQL_Version_Support_Matrix

Remember to use "Recalculate on Save" to get the correct Recurring Amount....

Client Profile, Domains, Registration Period

General Settings, Ordering, Auto Redirect on Checkout, Automatically forward the user to the payment gateway

It is important if you need help that you give as much information as possible, so that the person who can help, does not have to ask so many questions and guess what is and is not happening. Also, if you find the solution to a problem, share it, instead of saying that you have "found a solution" as many do. That's why we have this community!

By the way, does the invoice change its status to Paid, if the Next Due Date is not updated?

It seems that the Payment Gateway does not communicate with your WHMCS, in those cases where the Next Due Date is not updated.

Sorry, but I don't quite understand what you mean. Can you explain further?

The Next Due Date is updated automatically when the customer pays and Paypal communicates with your WHMCS. Can you see the amount the customer has paid in your PayPal account? A Subscription means that the customer is automatically charged and does not have to pay the invoice manually.

I'm not sure if I understand the question, but the Next Due Date is updated when the customer pays, in this case when Paypal charges the customer.

When I test on WHMCS 8.5.1 it works!

What about this? Maybe it still works. Haven't tested!

Only Default Nameservers, under General Settings, Domains is possible as standard. If you tell me where and how you want to park a domain, I might be able to make a suggestion ...

The following link explains what is possible: https://docs.whmcs.com/Promotions