I am adding In-App purchases to my app.As I am new to development I'm in big confusion. If I implement in-app purchase how will user pay money means from which wallet? And for this should I integrate any other payment gateway in my app? And how will the client get money after completion of purchase?
As per my experience below are my comments on your Question/confusion:
1. How will user pay money of InApp purchase ?
While the user needs to purchase any digital things from Apple user needs valid iTunes Account with attached Credit/Debit card in that iTunes account.
So while user purchase any digital things like iBook, Music, Paid App, IAP (in-app Purchase) it will directly deduct from his/her Credit/Debit card.
If any app owner selling any other physical good or services he/she can use any 3rd party payment gateway or use the default Apple pay if supported in that country.
Links for 3rd party Payment Gateway :
2. How seller get payment of InApp ?
As per Apple guideline App developer need to add his/her bank detail into iTunes Connect banking section (here) from where Apple get all detail and pay all payable amount of iBook, Paid App, InApp Purchase with deduction of 30% as commission on that purchases.
The seller can connect a personal or business bank account. Apple doesn't allow any 3rd parties such as Paypal.
Hope this info will help you to understand Apple Payment system.