I need a app development

I am looking for an experienced app developer to create a UPI payment system for both iOS and Android platforms. I need the project to be completed within 3 months but am flexible in terms of exact deadlines. The app should be efficient, secure, and user-friendly. The developer must have previous experience with UPI payment systems and be able to guarantee a secure and reliable app. Due to the sensitive nature of financial transactions, only experienced professionals should apply. I look forward to hearing from suitable candidates. Thank you.