What are the differences between POPPage JS and popunderjs.com

•popunderjs.com

it is very expensive
it have to pay about $119 USD per year per domain

but our POPPage JS only cost you $10
and you can use it in all your sites

•POPPage JS have more features such as "postback"
it is the feature that doesn't include in popunderjs

•you can pay for it just for one click
and there are many options to pay
✓Paypal
✓Credit card
✓ECPay in Taiwan
✓Alipay in People Republic Of China
some of the payment method has the discounts
look in Pricing