Hi,
1.
If you get the error "No payment methods found", it means that you didn't set properly your payment methods.
We have a FAQ with the list of possible problems here:
www.hikashop.com/en/support/documentatio...ins-listing.html#faq
If you're not able to find the problem after checking the points in that FAQ, please post a screenshot of the options of your payment plugin so that we can see what you did.
2.
You can indeed set several prices for a product based on the minimum quantity. Please note that you need to set the unit price.
So if you want to sell 2 products at $55, you should enter a price of $27.5 and a minimum quantity of 2 for that price.