Ask HN: What tech stack shall I use for a pay. processing by reading a QR code?

For my MVP's primary use-case, I want to scan a QR code by Android/iOS phone using their native camera, land on to a payment processing page, where the user can pay via credit cards, and optionally, mobile wallets. In a later iteration, I would like to split this payment to go to three different accounts. What tech. stack would you advise for this use-case in the US? What tech. stack would you advise for this use-case?