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I’m ready to wrap up the next milestone of my app by completing the payment feature. The focus is clear: • Finish the Payment Integration module with Cryptocurrency support. • Connect to a reputable crypto gateway or direct wallet API so users can pay seamlessly. • Handle transaction creation, confirmation callbacks, and error states. • Implement secure key storage and basic fraud-prevention checks. • Provide environment-specific configs (testnet and mainnet) along with concise setup docs. I’ll review the work against functional tests that prove a user can initiate, confirm, and see their crypto payment reflected in the app’s order status screen. If you have recent experience integrating Bitcoin, Ethereum, or similar coins using common libraries or SDKs, let’s get this milestone shipped.
Project ID: 40260880
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Active 3 mos ago
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14 freelancers are bidding on average $14 USD/hour for this job

Hello, Hope you're doing great! I am a PHP Developer who builds secure, fast, and business-focused web applications. I work with both custom PHP and frameworks, and always ensure that every project is optimized, scalable, and easy to maintain. What I Do 1. Custom web applications & business automation tools 2. API development and integration 3. Secure login, admin panels, and dashboard systems 4. High-speed, mobile-friendly websites 5. Migration, bug fixing, and performance upgrades Why Clients Prefer My Work 1. Clean folder structure & scalable architecture 2. Fully optimized and secure coding practices 3. Excellent communication & professional approac 4. Quick turnaround time with regular updates Ready to Start Share your requirements or preferred reference — I’ll analyze it and provide: 1. Best technical plan 2. Exact timeline 3. Budget estimate Looking forward to building something amazing for you!
$8 USD in 40 days
5.2
5.2

Hi, I can complete your crypto Payment Integration module with secure, testable implementation aligned to your milestone goals. Scope I’ll cover: • Integrate a reputable crypto gateway or direct wallet API (BTC, ETH, or similar) • Implement transaction creation, confirmation callbacks, and robust error handling • Ensure secure key storage (env isolation, encrypted secrets) • Add basic fraud checks and validation safeguards • Deliver clean testnet/mainnet configs + concise setup documentation I understand your acceptance criteria: users must initiate, confirm, and see payment status reflected reliably in the order screen. I’ll build against functional tests to ensure this flow is verifiable end-to-end. Clear communication, milestone delivery, and revisions included to reduce risk. Ready to start immediately. Best Regards, Shabahat Habib
$12 USD in 40 days
4.5
4.5

You’re looking to finalize the payment feature of your app by completing the cryptocurrency payment integration, including connecting to a reputable crypto gateway or wallet API and handling transaction callbacks and error states. I understand you also need secure key storage, fraud prevention, and environment-specific configurations for testnet and mainnet, along with setup documentation. With over 15 years of experience and more than 200 projects completed, I specialize in PHP and API integration, which are crucial for this task. My background includes building secure payment modules and integrating blockchain APIs to support Bitcoin and Ethereum transactions within web and mobile applications. I will implement the payment integration using reliable crypto SDKs and APIs, ensuring secure key management and proper handling of transaction confirmations and errors. The setup will include testnet and mainnet configurations, with concise documentation to simplify deployment. I anticipate delivering a fully functional module ready for your functional tests within a few days. Feel free to reach out so we can discuss your milestone requirements in more detail.
$9 USD in 7 days
1.9
1.9

Hello, I’ve carefully reviewed your project details, and it genuinely sounds exciting. I’d be glad to contribute my experience to help make it a success. With over 10 years of hands-on experience in blockchain, web, mobile, and software development, I’ve worked with clients across the globe and successfully delivered 500+ projects to date. My team and I bring strong expertise in blockchain technologies, including Solidity, Rust, Stylus, EVM-compatible chains, and Clarity, with hands-on experience delivering award-winning projects on the Avalanche and Arbitrum chains. Alongside blockchain development, we have deep proficiency in MEAN/MERN stacks, Flutter, React Native, PHP, Laravel, Python, AI-driven solutions, CRM/CMS platforms, and DevOps, enabling us to build secure, scalable, and high-performance digital products end to end. What drives me most is solving complex problems and transforming ideas into scalable, secure, and user-friendly products. I place high value on clear communication, transparency, and dependable delivery, ensuring clients feel confident in their decision to work with us. You can review my portfolio here: https://www.freelancer.in/u/NareshJoshiTech I’d appreciate the opportunity to discuss your project in more detail and explore how we can build something impactful together. Looking forward to your response. Warm regards, Naresh Joshi
$12 USD in 40 days
2.1
2.1

As a seasoned developer with over 12 years of experience, my skill set in PHP, payment gateway integration, and software architecture uniquely equip me to tackle your cryptocurrency payment integration project. Throughout my career, I've worked on various projects like yours - creating intuitive and secure digital payment systems for seamless user experience. Not only have I integrated with popular gateways for established cryptocurrencies like Bitcoin and Ethereum but I’ve also adeptly handled the entire payment workflow —creating transactions, managing confirmation callbacks, and error states— all which your project demands. get in touch with me, Ashok Sahu, so we can discuss your milestones further.
$12 USD in 40 days
0.0
0.0

Sumatera Selatan, Indonesia
Member since Feb 26, 2026
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