Wecaht Pay：If you would like use wechat pay, you have to open the website in your wechat. If you open the website with safari(iphone), google chrome or other browser, you will not able to use wechat pay.
Alipay: You can use Alipay with any browser
PayPal: Please don’t open website in Wechat, if you are going to pay with PayPal.
Credit Card: Pay with credit card in any browser and have not problem.