How to create Payment Gateway using java?
Detailed Description for payment gateway in java (It will helpful for me). I want to integrate with my application.
You don't want (and can't) implement a payment gateway. At least not by asking a question "how to create a payment gateway", and definitely not alone. What you are looking for, perhaps, is to be able to receive payments from customers. You can use an existing payment gateway:
All of them have well-described APIs and web-services to communicate with - just pick one with the best financial options for you and look for its documentation.
If you mean integrating with an existing payment gateway (such as PayPal's) then you better read their official IPN documentation or a third party tutorial such as this (written for PHP but the logic is the same for all languages).
If this is a different payment gateway vendor, you need to find documentation and a tutorial.
来源：https://stackoverflow.com/questions/2294798/payment-gateway-for-java