Need to add In-App Purchase in IOS with a single API -- 2

Greetings !, I am pretty confident to deliver this project, I have worked on several similar projects, can deliver quality work to tight deadlines with quality work, neat and clean code, crash free app, issue and bug free app. After completion the project I will give you the one year free service about the project. Anytime you can ask me to changes if you need. I can start work within two days after assigning. I have 6+ years of experience in Mobile App Development, I have expertise with 4 Programming language  (1.) Swift for iOS App,  (2.) Objective C for iOS App,  (3.) Flutter(Dart) for iOS/ Android App,  (4.) Unity(C#) for game app I would be grateful to have this opportunity to discuss about your requirements. Please let me know a time that works best for you and I will make sure that I make myself available.  If you have any questions about my work then don’t hesitate to ask.  I believe that communication is the most important key for better understanding. And About budget, We can negotiate with your budget, in this budget I give you best quality work in less time.  And you can pay me after completion and satisfaction with the work. You can pay me after deliver the projects.