if anyone could give me a clear high level answer that would be great. I want to integrate a payment gateway into my app eg: Strip/Braintree, and I have gotten it all working to the testing part but now I am wondering for me to move it to production do I need to host the back end server for retrieving the tokens myself? Currently I hosted the test server locally to test that it works. But what now? Do I need to host this on a server for all time so my app can get its tokens? Please help.