As an iOS developer in FG BCS, a leading investment company in the Russian market, I contributed to their app for private investors. We wanted to enable our users to top up the card balance with Apple Pay. There was no direct way to implement this flow, so we had to leverage a third-party service that created an order for the refill amount and transferred the payment to the client’s card using our API. The transaction processing and balance renewal on the screen were imitated.