What's the best payment gateway and why?

If you haven't fully tested your app with the 100 individual accounts Apple allows you to test via TestFlight or Hockey, then I'd suggest you should test thoroughly with your email list before launching to the app store. Things to look for at this early-stage: Activation and Breakage Points: From app download to user onboarding, where are people getting lost? Your goal is not only to have them download the app, but complete whatever steps for them to become your user. Optimizing the flow to ensure maximum conversion is a key first step. Engagement: How often are they completing the tasks you deem most important based on your business model? How can you increase this number? User Understanding: How clear is the app's UI and messaging? Where are they getting lost? Virality: While true virality is hard to measure at this stage (given the constraints of pre-launch testing), you can evaluate the potential effectiveness of any distribution tactics you might employ (contacts, OAuth's etc) in terms of user opt-in and conversion issues. Real analytical data is easier to interpret than user interviews but there is a such a treasure trove of good customer development intel from customer interviews. Those first 100 people who download the app should be personally interviewed about their experience, what they like, how much it solves their problem, how much of a problem that is for them in the first place and so on. Before you go live in the app store, I highly recommend you max out your installs in a private testing environment. I'm happy to talk this through with you in more detail in a call.

there is Balanced, Dwolla, Braintree but none of them seem to work in India yet.

Please realize that my suggestion would be slightly different if I knew which two countries. However, without knowing that here's what I'd suggestion: 1. Since you're just getting started figure out which country provides the best legal benefits for starting a company. This should include tax benefits, legal protection, and ease when it comes to filing paperwork (incorporating, managing payroll, taxes, etc.). This will undoubtedly save you time and money moving forward, and staying lean. 2. Once you've established your home base country, you'll still need to hire people in the other country as you scale. You may want to think about using a service like oDesk or Elance, not necessarily to recruit people but to manage ALL the paperwork associated with hiring international people. They will of course be given contract status. If you are going to be providing employees equity then I'd suggest consulting a lawyer for how people in the non-home base country will be treated. 3. Reporting revenue. You need to be very careful about whether you are providing goods and services. If it's goods keep in mind that you might be subject to tariffs. If you're providing services then I think you might be in the clear, but please double check. Finally, some countries might have an issue with where the revenue was actually made i.e. are you sitting in your office in your home based country while servicing clients in the non-home base country, or are you actually in the non-home base country. 4. No matter what you'll need to setup a remote working environment for yourself. Invest in the best technology you can, and find clients who are willing to utilize your services on a remote basis. Here are a few additional posts on running a remote team that I've written: http://femgineer.com/2013/09/running-remote-and-making-progress/ http://femgineer.com/2013/03/how-to-transition-to-a-remote-team/

The ideal way would be to hire the engineer while the project is still under development. You and the engineer should follow up with the outsourced partner in the process. This will give hold to the engineer and later more staff can be trained in upgrading or follow on versions of the product/service.

I just opened a normal business account and the used Stripe.com to process all credit card transactions - only tool 5 minutes.