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I need an experienced CodeIgniter developer to fix a payment gateway integration issue on an existing Codecanyon script (Affiliate Management System). The payment gateway (PayFast) worked previously but now fails with an "Authentication error" after a script upgrade. Requirements: - Expertise in CodeIgniter 3 - Experience with PayFast integration - Ability to troubleshoot and resolve authentication errors - Work must be done in the production environment Please only apply if you have relevant experience and can ensure a smooth, secure fix.
Project ID: 40250845
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Active 2 mos ago
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Hi, Your project Fix Payment Gateway Integration stood out instantly—and for good reason. After reviewing your requirements, I’m confident my experience in API Integration, MySQL, PHP, Web Development puts me in a strong position to deliver results that don’t just meet expectations, but raise the bar. I focus on clean execution, clear communication, and solutions that actually move the needle. If you’re looking for someone who treats your project like their own, we’ll work well together. View my profile & portfolio: ✨ https://www.freelancer.com/u/rohaansheikh90?sb=t ✨ Let’s connect via chat or a Freelancer call and turn your idea into something impactful. Here are my few work samples [login to view URL] [login to view URL] Best regards, Rohaan Sheikh
$30 USD in 7 days
1.0
1.0
144 freelancers are bidding on average $130 USD for this job

Hi, I have worked with CodeIgniter 3 and payment gateway integrations, and I can help fix the PayFast authentication error after your script upgrade. I’ll carefully review the recent changes, check API credentials, signature generation, and callback URLs to find the exact issue. The fix will be done securely in your production environment without affecting other system functions. My goal is to restore smooth and reliable payment processing as quickly as possible. I'm available right now to talk about the specifications so that I can go to work right away. With you, I hope to establish a long-term commercial connection. With gratitude and best wishes, Harpreet Singh
$120 USD in 7 days
9.5
9.5

Hello, With extensive experience in web design and development, specifically with CodeIgniter and PayFast integration, I am confident in my ability to effectively resolve the authentication error that has arisen post-upgrade on your Codecanyon script. My team at Our Software has successfully resolved a range of complex payment gateway integration issues similar to what you are experiencing now, ensuring smooth and secure transactions for our clients. Allow me to bring the same level of expertise to your project. For us, no project is too big or too small - we approach each one with a clear goal in mind: to deliver excellent results that exceed client expectations. This aligned vision is what made us one of the leading web service providers in Pakistan. We not only offer services but also focus on building long-term relationships based on trust and satisfaction. By choosing us, you are choosing a team that believes in creating miracles through belief and hard work. Let us turn this challenge into that positive 'WOW' factor you seek for your Affiliate Management System. I look forward to the opportunity to contribute my skills and ensure your business reaches new heights - together! Thanks!
$130 USD in 3 days
8.6
8.6

Hi, It’s clear that resolving this PayFast authentication error is crucial to restoring seamless payment processing for your affiliate system. With extensive experience in CodeIgniter 3 and deep familiarity with PayFast integrations, I understand how script upgrades can affect authentication tokens and API communication. I will carefully troubleshoot the issue directly in your production environment to identify and fix the root cause without disrupting your live service. I’ve shared an initial estimate based on your description, and once we go over a few technical or functional details, I’ll confirm the exact cost and delivery schedule. My approach ensures secure, stable integration restoring full functionality swiftly. Could you share which CodeIgniter version and PayFast SDK version are currently running in your production environment? Thanks, Asad
$95 USD in 5 days
8.2
8.2

Hi, With over 8+ years of experience in CodeIgniter, I’ve tackled similar payment gateway issues and can quickly identify and resolve conflicts in the code. I understand the importance of a secure and smooth fix, especially in a production environment. I’m available to start right away and can keep you updated throughout the process. Let me know if you’d like to move forward! Best Regards, Priyanka
$140 USD in 2 days
8.4
8.4

Hi, I will fix the PayFast authentication error on your Affiliate Management System so payments process again. After a Codecanyon script upgrade, PayFast auth failures usually stem from the signature string, parameter order or passphrase handling changed between versions. I will compare the old and updated payment module, verify the merchant key and passphrase, and test in sandbox before going live. Questions: 1) Do you have the previous working version of the script, or was it overwritten? 2) Is the passphrase set in your PayFast dashboard? I can share the relevant links with you in our chat. Ready to start whenever you are. Kamran
$90 USD in 2 days
8.4
8.4

Hi there, I understand the urgency of fixing the PayFast payment gateway integration issue in your Affiliate Management System. With extensive experience in CodeIgniter 3 and successful integrations of payment gateways, I can effectively troubleshoot and resolve the "Authentication error" you're facing due to the recent script upgrade. My approach ensures that the fix is not only smooth but also secure, adhering to best practices in a production environment. I'm confident that I can restore your payment functionality promptly. Let's discuss your project further to outline the next steps. Could you provide more details about any specific changes made during the script upgrade that might have affected the gateway? Thanks, Muhammad
$250 USD in 10 days
8.1
8.1

Dear Client, I am ready to help you on Immediate basis. I would love to discuss further, ASAP you schedule the interview. I am an experienced Full-Stack website developer, Develop near about 550 websites. I can create custom CRM, Laravel, ERP, Custom Plugin, Wix, WordPress, SquareSpace, Webflow, Shopify, MySQL, JavaScript, HTML, Woo-commerce Integration, jQuery, Third Party API integration, Bug Fixing, Troubleshooting, Malware Cleaning, Site Migration. When can we discuss? Regards
$150 USD in 3 days
8.2
8.2

Hello, I can help resolve the PayFast authentication error on your CodeIgniter 3 Affiliate Management System. I have solid experience with CodeIgniter 3, third-party gateway integrations, and debugging post-upgrade payment failures. Issues like this are usually caused by: • Updated PayFast signature/hash validation rules • Incorrect merchant credentials after upgrade • Changed return/notify URLs • cURL/SSL configuration mismatches • Modified request structure in the upgraded script I will: • Audit the upgraded payment module • Compare old vs new request/signature logic • Fix authentication/hash generation securely • Test end-to-end transaction flow in production (safely) • Ensure IPN/notify validation works correctly Work will be done carefully in production with minimal disruption. The Bid amount is subject to change and will be finalized after a complete project discussion. Ready to start immediately and fix this smoothly. Regards, Smile Mittal
$150 USD in 7 days
8.1
8.1

Authentication errors after a script upgrade usually mean the signature validation, merchant credentials, or callback verification logic changed. In CodeIgniter 3 systems from Codecanyon, upgrades often overwrite gateway helpers or alter hash generation methods. I would audit the PayFast integration end to end: merchant key usage, passphrase handling, MD5 signature creation, notify and return URL validation, and server side verification response. I will also confirm production environment configuration such as SSL, IP whitelisting, and PHP version compatibility. Fix will be implemented directly in production with controlled backup and rollback plan. Please share current error logs and PayFast configuration so I can diagnose immediately. -----------
$400 USD in 5 days
8.0
8.0

Hello, I am ready to start immediately, I am ready to help fix the PayFast payment gateway issue on your CodeIgniter script. I have strong experience with CodeIgniter 3 and have integrated PayFast in previous projects, so I can quickly identify and resolve the authentication error. I will carefully troubleshoot the problem and apply a secure fix directly in your production environment, ensuring the gateway works smoothly without affecting other parts of your system. I only take on projects I am confident about and will make sure your payment system is fully functional again. Thankyou, Azad
$150 USD in 7 days
7.7
7.7

Hi, I’ve worked extensively with CodeIgniter 3 and have integrated multiple payment gateways, including PayFast. I understand the nuances of handling sensitive data securely, especially in production environments. In one of my recent projects, we migrated from a custom payment solution to PayFast, where I implemented both server-side and client-side integrations. I also developed a custom PayFast web app to manage subscriptions and invoices, ensuring a seamless experience for users. I’m available for a quick introductory call to discuss your project in more detail and confirm that I’m the right fit. Feel free to message me anytime—I usually respond within 10 minutes. Let’s schedule a call and get your project moving. Best regards, Adil
$117.01 USD in 7 days
7.3
7.3

Hello Experienced CodeIgniter developer here, ready to expertly diagnose and fix your payment gateway integration issue. I specialize in resolving complex CI payment problems, ensuring smooth and secure transactions. Let's quickly connect to discuss the specifics and implement a robust solution. I'm ready to start immediately. Giáp Văn Hưng
$250 USD in 7 days
6.7
6.7

Hello I am a full stack developer. I have strong experience in CI, PHP, Mysql, ORM, Restful API, Payment gateway integration, PayFast, Checout, Card and so on. I am sure I can fix your issue correctly. Looking forward to your reply Regards.
$200 USD in 1 day
6.5
6.5

Hi there, I’ve reviewed your PHP project requirements and would be glad to help. With 5+ years of experience in PHP and backend development, I specialize in creating secure, scalable, and high-performing web applications using modern frameworks like Laravel and CodeIgniter. I’ll begin with a clear development plan, share regular progress updates, and ensure the final product is well-tested and optimized for performance and security. Let’s connect to discuss your project goals — I’m ready to get started! Best, Bhargav PHP Developer | Laravel & Backend Expert
$140 USD in 7 days
6.8
6.8

With over 7 years of experience as a Full Stack Developer, I bring to the table a comprehensive skill set that includes proficiency in CodeIgniter 3 and integrating payment gateways like PayFast. My past experiences include successfully fixing similar authentication errors after script upgrades – something that is particularly essential for your current project. My expertise also includes working in production environments, ensuring the highest standards of software quality and security. I am confident in delivering timely, efficient, and sustainable solutions that align with your project's needs. With my extensive knowledge of PHP along with other key technologies like MEAN/MERN stack, Laravel, and AWS services, I believe I can provide a holistic approach to resolve any underlying issues that might affect the payment gateway integration on your Affiliate Management System. Lastly, being a detail-oriented professional with excellent problem-solving skills, I intend to identify not only the symptoms but also the root causes of this issue. This thorough approach will help me rectify the problem effectively and prevent any potential reoccurrences in the future. Let's ensure a seamless and secure experience for your payment processing needs by choosing me for this task. Thank you for considering my profile. I'm eagerly looking forward to our potential collaboration!
$250 USD in 4 days
6.5
6.5

Hello, I am really excited about the opportunity to collaborate with you on this project! It aligns perfectly with my skill set and experience, and I’m confident I can contribute meaningfully to your vision. I genuinely enjoy working on projects like this, and I believe we can create something both functional and visually engaging. Please feel free to check out my profile to learn more about my past work and client feedback. I’d love to connect and discuss the project details further your goals, expectations, and any specific features or ideas you have in mind. The more I understand your vision, the better I can bring it to life. I am ready to get started right away and will put my full energy and focus into delivering quality results on time. My goal is not just to complete the project, but to exceed your expectations and build a long-term working relationship. Looking forward to hearing from you soon! With regards! Abhi
$250 USD in 7 days
6.6
6.6

As a seasoned web developer, I've had ample experience resolving complex issues just like the one you're facing. Over my decade-long career, I have evolved my PHP skills to be comprehensive and up-to-date, with a keen specialty in the CodeIgniter framework that will come without doubt very handy for fixing the payment gateway integration issue on your Affiliate Management System. Regarding your specific requirement of PayFast integration and troubleshooting "Authentication Error," I can assure you that I not only have prior experience with this specific payment gateway but also an in-depth understanding of the potential hurdles that might arise during integrations and upgrades. This will allow me to swiftly identify and eliminate the source of error ensuring a smooth and flawless payment process for your users. Lastly, what sets me apart is not just the expertise but also my company's dedication to ensuring client satisfaction at every step. We understand that even a small glitch in the payment system can hamper your business’s reputation, so we work diligently to provide quick, effective solutions for your unique needs. So let's make sure your Affiliate Management System is back on track and running securely; select me as your CodeIgniter expert and I guarantee success!
$199 USD in 7 days
6.4
6.4

Hi there. With over a decade of experience in web development, I have acquired the necessary expertise to take on your project. My proficiency in CodeIgniter 3 and past experience with PayFast integration make me the best candidate to resolve the authentication errors you're currently experiencing. Moreover, I'm adept at troubleshooting production environments, ensuring that your payment gateway is not only fixed but stays seamless and secure. My skills extend beyond just payment gateway integration. As such, I can take a more comprehensive look at your existing codecanyon script to ensure other functionalities remain intact after the fix. Additionally, my extensive exposure to various APIs will help me tackle any possible compatibility issues that arise during the upgrade process. I understand how crucial it is to deliver excellent, error-free work within agreed timelines. With this project, you should expect nothing less than my utmost dedication and relentless problem-solving capabilities. Let's collaborate today and put an end to this authentication error while safeguarding smooth payment processing for your affiliate management system. Looking forward to working with you.
$50 USD in 1 day
6.2
6.2

Hi, I can quickly troubleshoot and fix the PayFast integration in your CodeIgniter 3 Affiliate Management System. I have hands-on experience with PayFast authentication flows and resolving gateway errors after script upgrades, ensuring a smooth and secure fix directly in your production environment. I’ll make sure payments start processing reliably again without introducing any new issues. Looking forward for your positive response in the chatbox. Best Regards, Arbaz T
$200 USD in 7 days
6.4
6.4

Hello, I’m excited about the opportunity to contribute to your CodeIgniter 3 Affiliate Management System and resolve the PayFast authentication error after the recent script upgrade. With my expertise in PHP, CodeIgniter 3, MySQL, API Integration, Payment Gateway Integration, and production troubleshooting, and a strong focus on clean, scalable implementation, I can deliver a solution that aligns perfectly with your goals. I’ll tailor the work to your exact requirements, diagnosing the authentication flow, validating PayFast credentials and signature handling, reviewing post-upgrade changes, and implementing a secure fix directly in production with minimal disruption. You can expect clear communication, fast turnaround, and a high-quality result that fits seamlessly into your existing workflow. Best regards, Juan
$140 USD in 1 day
5.9
5.9

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