FlutterFlow App API Integration Specialist

@Friends4it

Hello Kike, I understand you're seeking a developer to integrate multiple APIs into your FlutterFlow app, focusing on payment platforms, Freedcamp, and QuickBooks. With experience in REST APIs and Firebase, I can seamlessly implement these integrations while ensuring smooth multi-domain functionality. - Proven expertise in FlutterFlow and Flutter. - Solid background in payment gateways and accounting sync. - Efficient in documentation for future reference. I'm dedicated to clear communication and will provide regular project updates. Let's discuss your project in more detail! What is your preferred timeline for the completion of these integrations? Thanks, Muhammad

@ayesha0124

Hi there, How r u? I have had a look at ur project i can handle it well as i have experience in Software Architecture, Payment Gateway Integration, PHP, API Integration, REST API, Flutter and Mobile App Development. I have worked on similar projects before too. Please initiate the chat and discuss in detail. Waiting for ur kind response. Regards

@abhisaini0188

Hello, Thank you so much for posting this opportunity it sounds like a great fit, and I’d love to be part of it! I’ve worked on similar projects before, and I’m confident I can bring real value to your project. I’m passionate about what I do and always aim to deliver work that’s not only high-quality but also makes things easier and smoother for my clients. Feel free to take a quick look at my profile to see some of the work I’ve done in the past. If it feels like a good match, I’d be happy to chat further about your project and how I can help bring it to life. I’m available to get started right away and will give this project my full attention from day one. Let’s connect and see how we can make this a success together! Looking forward to hearing from you soon. With Regards! Abhishek Saini

@annes01

This is exactly the kind of work I love doing. I specialize in integrating REST APIs and Webhooks for FlutterFlow apps. I have worked extensively with Payment Platforms, QuickBooks, and Freedcamp. My tools of choice include Flutter and Firebase. I have a strong track record of delivering seamless integrations and clear documentation. I am happy to offer my insight even if you decide to go in a different direction. Regards, Anne S.

@arbu1499

Hello, I can integrate your payment platform, Freedcamp CRM, and QuickBooks into your FlutterFlow app so payments, accounting, and project management all work together smoothly. Each integration will be set up for multi-domain use, tested for performance, and clearly documented for your future reference. I’ve worked on multiple FlutterFlow and Firebase projects with complex API integrations, including payment gateways, CRM systems, and accounting platforms. Let’s connect to discuss your requirements and get started. Regards, Arbaz M

@fullstack0407

✅ FLUTTERFLOW ✅ JAVA ANDROID ✅ IOS ✨HIGHLY RECOMMENDED✨ ** NO UPFRONT PAYMENT ** I can start immediately, Hi My name is Amarjeet Singh. I have read your job ( ). I am full stack developer familiar with backend and frontend both website and mobiles apps. If you're seeking a reliable, experienced developer to bring your web ideas to life, let's connect and discuss how I can contribute to your success. I'm ready for any Interview or want to discuss anything. I am available at your comfort time and start your work... Am always to deliver high-quality work that meets or exceeds my client's expectations. I can help you if you need a reliable and knowledgeable web developer to turn your ideas into reality. Let's achieve your business goals together.

@johnallenvillan1

Hello, I am excited to propose my expertise in API integration for your FlutterFlow app project. With experience in integrating REST APIs, I can seamlessly integrate Payment Platform, QuickBooks, and Freedcamp APIs. I will ensure smooth multi-domain scheme operation, API call settings, and performance testing. Clear documentation is guaranteed. Let's discuss the budget for quality work. Looking forward to collaborating with you on this project. Best regards, John Allen

@toriquldev123

Hello Dear! I write to introduce myself. I'm Engineer Toriqul Islam. I was born and grew up in Bangladesh. I speak and write in English like native people. I am a B.S.C. Engineer of Computer Science & Engineering. I completed my graduation from Rajshahi University of Engineering & Technology ( RUET). I love to work on Web Design & Development project. Web Design & development: I am a full-stack web developer with more than 10 years of experience. My design Approach is Always Modern and simple, which attracts people towards it. I have built websites for a wide variety of industries. I have worked with a lot of companies and built astonishing websites. All Clients have good reviews about me. Client Satisfaction is my first Priority. Technologies We Use: Custom Websites Development Using ======>Full Stack Development. 1. HTML5 2. CSS3 3. Bootstrap4 4. jQuery 5. JavaScript 6. Angular JS 7. React JS 8. Node JS 9. WordPress 10. PHP 11. Ruby on Rails 12. MYSQL 13. Laravel 14. .Net 15. CodeIgniter 16. React Native 17. SQL / MySQL 18. Mobile app development 19. Python 20. MongoDB What you'll get? • Fully Responsive Website on All Devices • Reusable Components • Quick response • Clean, tested and documented code • Completely met deadlines and requirements • Clear communication You are cordially welcome to discuss your project. Thank You! Best Regards, Toriqul Islam

@vanhuy19892011

Hello, With over 12 years of top-rated software development experience, including a deep understanding of end-to-end development for both mobile and web applications, I believe I am the ideal candidate for your project. I have comprehensive knowledge and a proven track record in integrating REST APIs, token authentication, managing webhooks and working with payment platforms – all of which are in line with the necessities of your app integration project. My professional history demonstrates an unwavering commitment to clean and maintainable code, scalable solutions as well as excellent communication skills essential for keeping you informed about project progress at every stage. Moreover, my experience extends to using thosto develop mobile backend in F Flutter using `FlutterFlow and/or Flutter +` Firebase so there won't be any need to worry about data syncing or performance issues. I understand the significance of accurate documentation and I can assure you that clear documentation of the integrations will be provided for future usage purposes. When working with me, you are availing services from a seasoned professional who values quality delivery on time and understands the importance of staying within budget constraints while still delivering top-notch solutions. Given my versatility with multiple domains and diverse tech stacks and a thorough understanding of payment gateways and accounting synchronization, rest assured your p Thanks!

@iradoicic04

Senior Flutter/FlutterFlow engineer with 7+ yrs integrating REST APIs/webhooks at scale. Strong Firebase (Auth, Firestore, Cloud Functions), multi-tenant (multi-domain) architectures. What I’ll deliver - Payment platform: cards/transfers, token auth, 3DS/webhooks (payment succeeded/failed/refund), tenant-by-domain routing (each PH own account). - QuickBooks: OAuth2, auto-sync payments/bills/journal entries, payout reconciliation, error queues + retry. - Freedcamp (CRM): OAuth/API integration for projects/tasks/contacts; event-driven webhooks. - FlutterFlow setup: API Calls config, custom actions where needed, secure secrets handling. - Backend: HTTPS Cloud Functions for webhooks, normalization, tenancy isolation. - QA/Perf: Postman collections, rate-limit handling, load tests, observability (logs/alerts). - Docs: Integration playbook, env matrix per domain, handover video. Security/Compliance - OAuth2/PKCE, HMAC verification for webhooks, idempotency keys, PCI handled by gateway, PII minimization. Timeline (est.) - Week 1: Payments + webhooks + multi-domain - Week 2: QuickBooks sync + backfill - Week 3: Freedcamp + end-to-end QA - Week 4: Hardening, docs, UAT fixes Cost (est.): $4.5k–$7.5k depending on gateway scope/tenants. Portfolio/API examples, detailed plan, and milestone breakdown available on request. Ready to start immediately.

@KarthikTechCon

Hi, I’m Karthik, with 10+ years of development experience and a strong track record in FlutterFlow, Flutter + Firebase, and complex REST API integrations. I’ve successfully connected payment platforms, CRMs, and accounting tools in multi-domain app environments, ensuring secure, scalable, and well-documented solutions. Here’s what I can deliver for you: Payment Gateway Integration: Card payments & transfers with secure token authentication, adapted for multi-domain accounts. CRM Integration: Freedcamp setup with webhook-based sync for tasks, contacts, and project data. QuickBooks Sync: Automated payments, bills, and accounting report synchronization in real time. FlutterFlow API Setup: API call configurations, optimization, and performance testing directly in FlutterFlow. Documentation: Clear step-by-step guide for future maintenance. Why choose me: Proven API integration experience with payment gateways, CRMs, and accounting systems. Strong grasp of token authentication, webhook handling, and Firebase backend. Committed to transparent communication, milestone updates, and on-time delivery. I can share portfolio links of similar integrations, provide a realistic timeline & budget, and ensure top-quality work that’s future-proof. Regards, Karthik

@humanspdy

Hello, At AppITron Solutions, with over 10 years in IT solutions, we excel in FlutterFlow + Firebase development and complex API/webhook integrations. Our skills & trust: Flutter, React Native, React.js, Node.js, Laravel, Android, iOS, REST API, JSON, XML, PHP, SQLite, MySQL, MongoDB, Google Maps, Geolocation, GPS, Location Tracking, GitHub, Bitbucket, GitLab, and strong backend/database design with cross-device compatibility. We have proven experience in integrating payment platforms, accounting tools like QuickBooks, and CRM systems such as Freedcamp, ensuring secure token authentication, multi-domain adaptability, and seamless data synchronization. Which payment platform do you plan to use for card payments and transfers? Should the QuickBooks integration include automated invoice generation? Let’s connect to plan the integration stages and documentation structure. Profile: https://www.freelancer.com/u/humanspdy Swati Sharma

@mobiwebsolutions

Hi There!!! I have studied your project description very well and clearly understand the integration scope between your FlutterFlow app and external APIs like QuickBooks, Freedcamp and a card payment gateway. I am best fit for this role because I have successfully delivered multiple Firebase + REST API integration projects with secure token auth and webhook handling. – I have integrated QuickBooks API for syncing bills, invoices and reports – Implemented CRM syncing using Freedcamp and Trello webhooks – Configured multi-domain payment setups using Stripe and PayPal At the end of the project I will provide responsive integration UI, database linkups, webhook testing, complete documentation, and all source code files. With 9+ years experience as a full stack developer, I have worked on Flutter and FlutterFlow based apps integrating complex APIs and third-party tools. I have worked on accounting automation tools, multi-tenant systems and app dashboards that connect with external payment services. Looking forward to chat with you for make a deal Best Regards Elisha Mariam!

@hardik101776

Hello Kike, I am excited to help you with the API integration for your FlutterFlow app. With extensive experience in integrating REST APIs and Webhooks, I am well-prepared to seamlessly integrate the payment platform, Freedcamp, and QuickBooks into your project. My background in Flutter and Firebase ensures that I can effectively set up API calls and conduct performance tests to guarantee a smooth user experience. I will also provide thorough documentation for future reference and establish a multi-domain scheme for each payment account. I would love to share my portfolio, which includes various successful API integrations, along with an estimated delivery time of 10 days and a bid of 200 USD for this project. Thanks, Hardik

@dtk507

Hi kike, I have expereince integrating REST APIs, token-based auth, and webhooks in FlutterFlow + Firebase environments. I can connect payment platform, Freedcamp, and QuickBooks with multi-domain support and provide clear documentation for future updates. My approach ensures you not only use but speak use the integrations smoothly with tested, production-ready performance.

@oleksandrbosyi

Hello, As a proficient Full-Stack and Backend Developer with extensive experience in web and mobile app development, including integrating REST APIs, your project is right up my alley! With a deep understanding of FlutterFlow, Firebase, and various CMSs like WordPress and Wix, I offer the technical prowess you need to accomplish all your desired integrations. In terms of API integration, I've worked with diversified payment platforms, such as PayPal, Stripe, and Square. Additionally, my previous clients have lauded my efficient utilization of token authentication and webhook management. I'm also well-versed with integrating transaction data from QuickBooks for seamless accounting synchronization, which aligns perfectly with your requirements. Furthermore, I understand the vital need for streamlined communication and providing regular progress updates for successful collaboration. You'll appreciate my attention to detail when it comes to crafting clear documentation – it ensures future maintenance or expansion of the integrated features won't be a hassle. My fixed delivery time frame has always been respected. And as 비용+ hopeful we could negotiate a budget that satisfies both parties. Let's get started on integrating your FlutterFlow app! Thanks!

@loinguyen254

With over 6 years of programming experience, I’ve honed my skills in API Integration, most recently using Flutter and Firebase as a backend. My proficiency in these technologies, combined with my extensive understanding of token authentication and webhook management, make me an especially qualified candidate for your project. Moreover, I understand the importance of clear documentation, robust testing and flawless integrations within the scope of each domain ensuring comprehensive business process mapping. As a developer, I’ve integrated multiple REST APIs into various platforms and designed secure payment gateways. My technical background is complemented by my strong communication skills that will keep you routinely updated on the project's progress at every stage. Given this blend of strong programming skills, knowledge of diverse payment platforms and accounting synchronization processes and verifiable integration experience - choosing me allows you to fully leverage my attributes to achieve your objectives with the highest quality code delivered on time and within budget. Partner with me today for a 100% satisfaction guarantee on a job well done!

@shushmobiweb6

Hello!! I HAVE CREATED SIMILAR PROJECTS BEFORE AND I CAN SHOW YOU! I have strong experience integrating REST APIs, payment gateways, QuickBooks, and CRM platforms like Freedcamp, especially in FlutterFlow and Flutter with Firebase backends. My past projects involved multi-domain payment setups and secure token authentication, ensuring seamless synchronization of payments, bills, and accounting reports. I understand the importance of performance testing and clear, maintainable API call setups in FlutterFlow to deliver a smooth user experience. I am confident in managing webhooks and adapting integrations for complex multi-account environments. Communication and delivering progress updates at every stage are priorities for me. For this project, I estimate delivery within 3-4 weeks, depending on the specific APIs and scope. I will provide detailed documentation to facilitate future maintenance and scaling of your integrations. My proposed cost is competitive and reflects the quality and experience I bring. I am happy to discuss and adjust as needed to fit your budget and timeline. Best Regards Sushma S.

@ssnothinginlife3

As an experienced team specializing in mobile app development, including Flutter and PHP, my agency would be the perfect fit for your project. We have successfully integrated REST APIs with webhooks in various applications, and your specific needs align perfectly with our skillsets. We are proficient in integrating payment platforms, CRM systems like Freedcamp, and accounting software such as QuickBooks. Additionally, we have extensive knowledge of token-based authentication and can ensure a secure API call setup on FlutterFlow. To maintain clean code and ensure its operational efficiency, we will also conduct performance tests. Your project's documentation requirements are well-understood by us. Our portfolio showcases our previous successful integration projects similar to yours. We assure not only top-notch quality but also timely delivery and well-budgeted pricing. Partnering with my agency guarantees both accessible costing and no compromise on experience and quality. We look forward to working with you!