You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: interface.go
    path of file: ./repos/sealos/controllers/pkg/pay
    
    the code of the file until where you have to start completion: // Copyright Â© 2023 sealos.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a cop
    
func NewPayHandler(paymentMethod string) (Interface, error) {
	switch paymentMethod {
	case "stripe":
		return &StripePayment{}, nil
	case "wechat":
		return &WechatPayment{}, nil
	default:
		//return nil, fmt.Errorf("unsupported payment method: %s", paymentMethod)
		//TODO Now set it as the default wechat, and modify it a few days later
		return &WechatPayment{}, nil
	}
}