Hi,
auto generated shipping labels
We've developed several plugins which interface with shipping services like ShipStation which allow you to automatically generate the shipping labels.
other payment methods
We can't develop a plugin for each payment gateway out there. There are just too many. Still we regularly develop new payment plugins. We released last month one for UPI in India, and in September HikaShop will come with a new PayPal Checkout plugin.
Sure, we might not have yet developed the payment plugin you would need but I can't say for sure if you don't provide a name.
estimate
Are you talking about shipping fee estimate ? Obsidev actually developed a plugin for that:
www.hikashop.com/marketplace/product/244...tion-by-obsidev.html
front end invoicing
We never worked on that. Note that HikaShop is primarly a shopping cart solution. I believe an external extension would be more adatped for that.
In fact, an invoicing extension was tightly integrated with HikaShop years ago:
www.joomlathat.com/invoice-manager
extensions.joomla.org/extension/invoice-manager-for-hikashop/
If you would need something for invoicing linked to HikaShop, this would be it.
Regarding renewing, I would say that if you don't need new things and you don't update Joomla then don't renew.
But it's not like we don't develop new things. If you look at HikaShop's changelog, we release new versions every few months, each time with new features, improvements and fixes. And many of the new features are things that are requested by people using HikaShop.
We also add compatibility for new versions of Joomla, PHP, etc and that would be crucial if you update your Joomla or your hosting.