Cross-Platform Subscriptions & API Update

@jastp

Hi there, Jas this side from Logictrix and I am ready to work on your app with my team and with a promise for long term support in fairly low cost. Please just give me your few minutes for the chat so that we can discuss all the important points about project as well as we can clarify any queries from both side to go ahead further for final agreement. We will use AI tools to developed your app very quickly and so in cheapest cost as we are expert in AI development and we used many AI platforms like openAI, Freepik, Antigravity, Cursor etc for App development and other AI work. We have developed around 400+ Android and iOS apps using Native and Flutter SDK in the past 15 years, Many apps are Live in Google play and App store. We will share our detailed portfolio over the Chat once we connect. Looking forward to your reply... Thanks and Regards Jas

@n2rtechnologies

Hi, I've built subscription flows for iOS and Android apps before — switching from test buttons to live payments is exactly what we do. I noticed you need the dummy buttons replaced with real payment processing. We handle that integration cleanly with both platforms, plus the backend API updates to track active subscriptions. I have delivered 1500+ web and mobile projects over 14+ years — happy to share relevant examples. Send over the current app structure and I'll outline the approach. Thanks, Hasan

@asifalimzd

Hi there, I can integrate fully production-ready in-app subscriptions for both iOS and Android including StoreKit/Google Play Billing setup, receipt validation, restore purchases, cancellation handling, and all subscription state management while also refactoring your app to work seamlessly with the new backend API based on the OpenAPI spec and changelog you provide. I’ve worked on cross-platform mobile apps with subscription flows, API migrations, and TestFlight/Google Play internal testing, so I understand the edge cases around expired plans, failed purchases, webhook/receipt validation, and maintaining stable UI behaviour during backend transitions. I’ll deliver clean commits/PRs, proper testing coverage, and a short demo report showing both success and failure scenarios for purchases and API calls before submission review. Is your app built with Flutter, React Native, or native iOS/Android code so I can outline the most reliable subscription integration approach?

@rahuliitm69

Hi there, I can help complete the production-ready subscription flow for both iOS and Android including StoreKit, Google Play Billing, receipt validation, restore purchases, expired-plan handling, and all related UI state updates. I can also refactor the existing API layer based on your new backend documentation, update the affected endpoints/response handling, and make sure all screens continue working properly without crashes or broken flows. Since the app is already running, this is more about careful integration and testing rather than rebuilding things, so I’ll keep the implementation clean and structured with proper testing for both success and failure scenarios before submission to TestFlight and Play Console internal testing. I would request to connect on a quick chat and share the current codebase plus API changelog/OpenAPI file so I can review the scope and start quickly. Thanks, Rahul A.

@corpmember29

Hello, {{{ I HAVE CREATED SIMILAR APPS BEFORE AND I CAN SHOW YOU }}}} I have carefully reviewed your requirements for integrating production-ready in-app subscriptions and updating the existing API layer. I have 10+ years of experience in mobile app development and have previously worked on StoreKit, Google Play Billing, receipt validation, restore purchases, subscription state handling, and backend/API refactoring for cross-platform applications. I can efficiently implement the complete iOS & Android subscription flow, including restore/cancel handling, validation, UI state updates, and TestFlight/Google Play internal testing support. I will also update the app with your new backend APIs using the provided OpenAPI documentation and ensure all screens, endpoints, and responses work smoothly without crashes or warnings. I will provide clean, well-structured code with proper commits/pull requests, along with a detailed test report or screen recording covering both success and failure scenarios. WE WILL WORK WITH AGILE METHODOLOGY AND PROVIDE ASSISTANCE FROM ZERO TO APP STORE & PLAY STORE PUBLISHING. I WILL ALSO PROVIDE 2 YEARS FREE ONGOING SUPPORT ALONG WITH COMPLETE SOURCE CODE HANDOVER. I eagerly await your positive response. Thanks Christina

@SBITServices

Hi, I have strong experience with Php, Laravel and Code ignitor. I’ll develop robust and secure web application just the way you want. I can handle any updates you need. You can check my reviews to see the quality of my work, I will share my previous application in private chat. Lets connect in chat so that We discuss further. With Regards, Sai

@point2solutions

Hello, With over 8+ years of experience implementing production-ready in-app subscriptions for both iOS and Android, including StoreKit, Google Play Billing, receipt validation, restore purchases, and subscription state handling. I can also update your app to work with the new backend by refactoring the API layer, adjusting endpoints, response mappings, and validating that all affected screens continue working correctly without crashes or warnings. I look forward to your project. Best regards!

@ZohaibRoy

⭐⭐⭐⭐⭐ Create Seamless In-App Purchases for Your Mobile App ❇️ Hi My Friend, I hope you're doing well. I've reviewed your project requirements and see you're looking for an expert to enhance your mobile app's subscription flow. Look no further; Zohaib is here to help you! My team has successfully completed 50+ similar projects for in-app purchase integrations. I will ensure a smooth transition to real purchases, along with the necessary backend updates. ➡️ Why Me? I can easily handle your subscription flow update as I have 5 years of experience in mobile app development, focusing on in-app purchases, StoreKit, and Google Play Billing. My expertise includes API integration, UI state management, and testing. I also have a strong grip on backend connections and data validation, making sure everything runs smoothly. ➡️ Let's have a quick chat to discuss your project in detail and let me show you samples of my previous work. I look forward to discussing this with you! ➡️ Skills & Experience: ✅ iOS Development ✅ Android Development ✅ In-App Purchases ✅ StoreKit Integration ✅ Google Play Billing ✅ API Integration ✅ Receipt Validation ✅ UI State Management ✅ Testing & Debugging ✅ Code Review ✅ Clean Code Practices ✅ Project Management Waiting for your response! Best Regards, Zohaib

@doomshellsl

Hi, We at Doomshell Software Pvt. Ltd., with 20+ years of experience in mobile app development, cross-platform engineering, and API integrations, would love to support you in upgrading your existing app with production-ready in-app subscriptions and seamless backend migration. Our approach: 1. Cross-Platform In-App Purchase Integration • Full StoreKit (iOS) + Google Play Billing (Android) implementation • Subscription lifecycle handling (activate, renew, expire) • Restore purchases + secure receipt validation • UI state sync for active/expired plans 2. API Migration & Refactoring • Switch to new backend base URL • Update endpoints, parameters, and response mapping • Ensure zero-break data flow across all screens • Error handling + fallback mechanisms for stability 3. Quality & Release Readiness • End-to-end testing for purchase + API flows • TestFlight & Play Store internal testing support • Clean, well-documented code commits / PRs Quick questions: • Are subscriptions currently managed via a third-party backend or direct StoreKit/Play Billing only? • Should we support trial periods or promo offers in the new flow? We’re ready to ensure a smooth, crash-free release across both platforms with a production-grade implementation. Best regards Doomshell Software Pvt. Ltd.

@InterconnectBPO

Hi, We can handle both the production-ready subscription integration and API migration inside your existing app without disrupting the current flow. We can deliver: • Real iOS StoreKit + Google Play Billing integration • Subscription purchase, restore, expiry, and cancellation handling • Receipt validation and proper subscription-state UI updates • Full migration to the new backend/API structure • Updated endpoints, request handling, and response mapping • Testing for success/failure purchase and network scenarios • Clean commits/documentation for quick review We have experience with cross-platform subscription systems and API-layer refactoring and can review the OpenAPI spec/changelog first to estimate the fastest rollout path. Regards, Interconnect Team

@mahig47

Hello! As per your project post, you’re looking to upgrade your existing mobile application by replacing placeholder subscription buttons with fully functional production ready in app purchases for both iOS and Android, while also migrating the app to a new backend API structure. The goal is to ensure seamless subscription management, accurate billing state handling, and complete compatibility with the updated backend without disrupting the current user experience. My focus will be on delivering a stable and production ready implementation, featuring: StoreKit and Google Play Billing integration, subscription purchase and restore flows, receipt validation, active and expired subscription state handling, secure purchase verification, API base URL migration, endpoint and parameter updates, response mapping adjustments, and complete testing across all affected screens and workflows. I specialize in cross platform mobile app development, subscription systems, API integrations, and backend migration workflows with focus on scalability, maintainability, and production stability. My experience includes handling App Store and Google Play billing flows, authentication systems. Let’s connect to review the current codebase structure, subscription plans, API changelog, and deployment workflow so we can finalize the implementation plan and testing strategy. Best regards, Nikita Gupta.

@mrresearcher99

Hi there, I’ve reviewed your Flutter app requirements and would love to help. With 5+ years of experience in cross-platform development, I specialise in clean UI, smooth performance, and robust API integration. I’ll begin with clear planning, share regular progress updates, and ensure the app is fully tested before launch. Let’s connect to discuss your vision — I’m ready to get started! Best, Bhargav Flutter Developer | Android & iOS Expert

@taimoorkhan311

Hello, With 4 years of experience in Mobile App Development, iOS Development, and Backend Development, I am well-equipped to handle your project requirements. I understand the need to switch the subscription flow in your existing mobile app to real in-app purchases on iOS and Android, along with updating the app to consume a new backend API. I have carefully reviewed your project description and am confident in my ability to deliver a seamless subscription-based in-app purchase flow and update the code to consume the new API efficiently. My expertise in PHP, Mobile App Development, iOS Development, and Backend Development aligns perfectly with the tasks at hand. I kindly invite you to connect in chat for a detailed discussion. Looking forward to collaborating on this project. Best regards, Taimoor from Pixels Soft

@durgesh8527

I'm delighted to introduce myself, Sunil, a seasoned Full-Stack Developer with over 10 years of experience specializing in mobile app development and backend APIs along with languages like iOS (Swift) and PHP. I noticed that your project requires two main areas of expertise - cross-platform subscriptions and API update. I have significant exposure to both of these areas — on one hand, I have a rich track record in orchestrating foolproof subscription models on iOS and Android platforms, ensuring robust StoreKit / Google Play Billing integration and handling UI changes closely tied to active or expired plans. And on the other hand, my proven competence in managing API layers from scratch, tweaking existing ones based on OpenAPI files, including migrating to entirely new backends makes me the ideal fit for your requirements.

@rbtech1984

Hi There!!! ★★★★ ( Cross-platform StoreKit & Google Play Billing integration with restore flow and updated API refactor for all impacted screens ) ★★★★ I’ve read your project carefully and understand that the app already builds fine, but now needs real production-ready subscription handling across iOS and Android, along with migration to the new backend API. I can also ensure all updated endpoints, params, and response mappings work smoothly without breaking existing screens. ⚜ StoreKit & Google Play Billing integration ⚜ Subscription purchase, restore & cancel handling ⚜ Receipt validation & active/expired state logic ⚜ API base URL migration & endpoint refactoring ⚜ Response mapping updates from OpenAPI changelog ⚜ Internal testing support for TestFlight & Play Console ⚜ Clean commits, testing report & screen recordings I’ve worked on several cross-platform mobile apps with subscription systems and backend migrations, and I genuinely enjoy solving these kind of production-level integration tasks. I’ll carefully update the billing flow, validate edge cases, refactor service layers, and test both success/failure paths so review process goes smooth without crashes or warning issues. Would love to discuss the stack and timeline further. I’m ready to start soon and keep communication clear throughout the work. Warm Regards, Farhin B.

@codefusion53

Hi, I can help replace the dummy subscription buttons with a real production-ready in-app purchase flow for both iOS and Android. I have experience working with StoreKit, Google Play Billing, receipt validation, restore purchases, subscription state handling, and UI updates based on active, expired, or failed plans. I can also update the app to use your new backend by reviewing the OpenAPI file and changelog, swapping the base URL, refactoring affected service calls, and testing each impacted screen to make sure data loads correctly without crashes or console warnings. My approach would be to implement purchases first in sandbox and internal testing, connect validation and restore logic, then update the API layer and verify both happy-path and failure-path behavior. I will provide clean commits or a pull request, plus a short test report or recording for review. Best, Justin

@vinhtq0703

⭐⭐⭐⭐⭐ + 100% Job Score freelancer Hi, thank you for this chance to apply for your project. ▸ I have experience with mobile subscription systems, API refactoring, and production app integrations. I can replace the dummy subscription flow with real iOS StoreKit and Google Play Billing implementation, including receipt validation, restore purchases, cancel/expiry handling, and correct UI state updates. ▸ I can also update the app to work with your new backend using the provided OpenAPI spec and changelog, ensuring all affected endpoints and screens continue working correctly. Ready to start immediately and help get this through TestFlight and Google Play internal testing quickly. Best regards, Vinh

@melikatfz

Hi there, regarding your app's subscription transition, a key technical insight is ensuring real-time receipt validation and restore logic function smoothly. Many overlook UI state updates post-subscription change; my approach efficiently manages these to deliver a seamless experience. I once revamped an app's billing system, boosting retention by 20% due to flawless integration and restoration. I include 30 days of post-deployment bug-fixing to ensure everything runs perfectly. I'm curious, could you specify any unique parameter changes in the new API endpoints? Let's discuss how I can streamline this transition for you.

@fullstack0407

I have read your job post and I am very interested in working on your mobile app subscription and API migration updates. I am a Mobile App and Full-Stack Developer with experience in StoreKit, Google Play Billing, subscription workflows, receipt validation, API refactoring, and cross-platform mobile applications. I have worked on production apps where in-app purchases, restore flows, backend migrations, and stable API integrations were important for app store approval and user experience. My approach will be to first integrate production-ready subscription handling for both iOS and Android including purchase flow, receipt validation, restore purchases, subscription state handling, and cancellation logic. Then I will refactor the API layer based on your new OpenAPI documentation, update affected endpoints and response mappings, and thoroughly test all impacted screens and workflows. I will also provide clean commits, testing documentation, and review-ready code to ensure smooth TestFlight and Google Play internal testing approval.