Hi,i have seen your project you need a iPhone App, With Ethereum Smart Contract Built in that has a built in smart contract to do transactions with erc20 tokens. A different type of smart contract sending different type of tokens could work as well. I just am more familiar with the ethereum smart contract eco system.
I have 6+ years of expertise in Mobile App With Web Admin panel/ API, design and development with a web admin panel/API. I work as a full-stack developer. I have some professional engineers that are well-versed in mobile app development technologies like Flutter, React Native, ionic, Swift, Java, Kotlin, Php laravel, CodeIgniter, Mysql, Firebase, Node js, and others.
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Thanks
Regards
Anamika