iOS Expert Developer | Swift or Swift UI experience needed

I have two applications, the first one is built using Swift, and another one in Swift UI both applications are completed, in the first app (Swift only) I need someone to integrate PayU, fix some and attach the orders and their history to the backend (APIS); the Android part is done, I will share the APK to review; I don't have enough budget for this so want it to be done in around 100$. about the second project (Swift UI), the application is already built. I just want someone to add a new video call feature using Twilio SDK on the support section and attach it with web services API so they can call each other (I will explain in detail in the chat)