I only know paypal is the famous one and pre-installed in the cart. My site support multilanguages but the paypal checkout only show english checkout screen. Is there any payment gateway can do the follows:
1. auto switch to the same language environment (support english, traditional chinese and simplified chinese) as the cart;
2. no monthly fee;
3. can apply for non-us or other countries citizens such as Hong Kong.

Any kindly suggest will be welcomed but better you are using now.

Thanks.