Customer country and currency or customerIP are required for correct price calculation because tax rate depends on the country. If none of these params are given, the price will be calculated for request IP address. If all of them are given, the given country is the most important.
Please note that when using Cleeng Merchant, customerIP should be available for the purpose of proper tax calculation in the US and Canada. It is recommended that customerIP is passed in the register, login and create order methods.
Please note that when a free trial period or 100% coupon is used for a given offer, the price is not taxable. Therefore, the price to be displayed is excluding tax.
After the free trial period ends or a 100% coupon is redeemed, the price for the following periods will include tax (if applicable).