QR Code Payment Mobile App -- 2

I'm looking for a skilled app developer who can create a mobile application for both iOS and Android platforms.
The QR code is universal and can be scanned by the respective apps including the MPESA app.
Merchants will have one QR code that works with the respective apps. The code will contain the merchant’s information such as business name, unique identifiers for the merchants payment service providers, transaction currency and amount.
How to Pay via the QR Code
At a merchant’s point of sale, you’ll see the option to pay via QR code showing the store displayed on a sticker or POS device.
You’ll scan via the app provided by your payment service providers of choice(Bank, mobile network operator, Payment service provider) which includes those mentioned above. After scanning, you confirm the merchant store name and transaction value before accepting the payment request.
If transaction value is not specified in the merchant QR code, you’ll go ahead and enter the amount required.
You then initiate the payment by authenticating the transaction by entering your PIN after all the necessary payment details are captured.
Your payments service provider will initiate the payment transactions to the merchants service providers using existing payment transaction rails.
Once the payment is complete, you’ll be notified by SMS or in the app to download the receipt.