Hi,
I will surely help you to develop native apps for both Android/iPhone platforms. I have read your requirements and It's something that I can turn around.
I have 7+ years of working experience and here is the technology stack I have expertise in:
* Mobile App Development: React Native, PHP, JavaScript, NodeJS, HTML, CSS.
* Good knowledge of the Payment Gateways (Stripe, PayPal, Pay-flow, Square Up), In-App purchase, Google Admob, Ongoing maintenance & Improvement, Publishing on App Store.
With Regards
Thanks
Mayank