do {
	try Checkout(viewController: self)
		.setEnv(<<Environment Parameter>>) // set environment
		.setWeChatAppID(wechatAppID: "<<WeChat Open Platform AppID>>", universalLink: "<<Universal Link>>")
		.setCardInfo(name: "", cardNo: "", cvcNo: "", expMonth: 1, expYear: 2020, countryCode: "MY", isSave: true) // only use for new card 
		.setToken(token: "<<Card Token>>",cvcNo: "<<Cvc No>>") // only use if use existing card token
		.setBankCode("<<Set Bank Code>>") // only use for fpx, get the bank code from open api
		.pay(method: <<Method Parameter>>, checkoutId: "<<Get Checkout Id from API>>", result: Result())
} catch {
		print("error: \(error.localizedDescription).")
}

// Callback Result
class Result: PaymentResult {
	func onPaymentSuccess(transaction: Transaction) {
		print("SUCCESS", transaction.getStatus())
	}

	func onPaymentFailed(error: PaymentError) {
		print("FAILED", error.getCode())
	}

	func onPaymentCancelled() {
		print("CANCELLED", "User cancelled payment");
	}
}

	do {
		try Checkout(viewController: self)
			.setEnv(<<Environment Parameter>>) // set environment
			.setWeChatAppID(wechatAppID: "<<WeChat Open Platform AppID>>", universalLink: "<<Universal Link>>")
			.pay(method: <<Method Parameter>>, checkoutId: "<<Get Checkout Id from API>>", result: Result())
	} catch {
			print("error: \(error.localizedDescription).")
	}