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I’ve already coded a full sports-oriented HTML workflow, but I’m stuck at the point where the Parlay API should kick in. The call keeps failing at the authentication stage even though I’m supplying the provided API key exactly as documented—every attempt simply returns an error message instead of the expected payload. Here’s what I need from you: dive into my existing codebase, trace the handshake with Parlay, and pinpoint why the key isn’t being recognised. Once the authentication issue is resolved, I’d like you to confirm data can be pulled successfully, then apply the same fix-logic to a couple of smaller companion APIs that follow a similar pattern. The stack is plain HTML/JavaScript with fetch/XHR, though I’m open to adding Axios or a lightweight Node proxy if that ultimately proves cleaner for header management. I’ll give you the repository link, current key, and the exact error response. Your job is to get the connection fully operational, explain what went wrong, and leave the code clearly commented so I can maintain it going forward.
Project ID: 40606764
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A Parlay API call failing at authentication even with the correct key is a very familiar pattern to me, and I can trace exactly where the handshake breaks. In browser HTML/JS, auth failures like this are usually one of a few things: the key sent in the wrong header or scheme (Bearer vs x-api-key), CORS stripping or blocking the auth header on a browser-origin request, or a preflight issue — and often the real fix is routing the call through a lightweight Node/Axios proxy so the key is attached server-side, cleanly and securely, rather than exposed in front-end fetch. Once you share the repo, key and exact error, I'll pinpoint the cause, confirm data pulls successfully, then apply the same fix-logic to the companion APIs. I'll explain plainly what went wrong and leave the code clearly commented so you can maintain it. I can start right away.
$30 USD in 1 day
7.6
7.6
115 freelancers are bidding on average $146 USD for this job

Hello, I can troubleshoot the Parlay API authentication issue in your existing HTML/JavaScript code, identify whether the problem is related to headers, key format, endpoint configuration, CORS, or request structure, and implement the correct fix. I’ll verify that the API returns valid data, then apply the same authentication pattern to the companion APIs. If direct browser requests are restricted, I can add a lightweight Node.js proxy for secure key handling and reliable header management. The final code will be clean, tested, and clearly commented, with a brief explanation of the original issue and the solution. Regards
$150 USD in 2 days
8.6
8.6

Good to see this project, I will trace the full request chain to Parlay, isolate the auth failure (common culprits: missing headers, incorrect key encoding, or CORS preflight stripping the token), fix it, confirm live data pulls, then apply the same pattern to your companion APIs. All changes will be clearly commented. On a similar API debug, the issue turned out to be the key sent as a query param instead of a Bearer header. I will document exactly what went wrong so you own the fix. Questions: 1) Is the error a 401, 403, or something else entirely? 2) Are you calling Parlay directly from the browser, or through any proxy? Share the repo link and error response and I will start tracing tonight. Looking forward to talking through the details. Kamran
$90 USD in 5 days
8.6
8.6

I’ll trace the existing HTML/JavaScript workflow from the fetch/XHR request through Parlay’s authentication response, identify why the supplied API key is not being recognised, and get the expected sports data payload returning successfully. I’ll check the exact endpoint, HTTP method, header name and format, required prefixes, content type, query parameters, key encoding, and any CORS or browser-related issues. If the key should not be exposed in the browser, I’ll add a small Node.js proxy and keep the credential server-side while preserving the current frontend flow. After validating the Parlay response, I’ll apply the same authentication and error-handling logic to the two companion APIs, including useful logging for failed requests and clear comments explaining the fix. I’ll test successful and rejected authentication cases and leave the code maintainable rather than applying a one-off workaround. I can start immediately and complete this within 2 days. Is the exact Parlay error response available along with the repository, so I can reproduce the failure first? Muhammad Saad
$85 USD in 2 days
8.0
8.0

Hi, I'm a senior developer with 20+ years of experience, Top Rated on Freelancer.com with 1,500+ completed projects and a 5-star record, and I've fixed similar API authentication issues before. I'll start by reviewing your existing codebase and Parlay's API documentation to trace the authentication failure, checking for common mistakes like header formatting, encoding, or timing issues. I'll test the key directly against Parlay's endpoint to isolate whether the problem is with the key itself or its implementation in your code. Once resolved, I'll validate the API call works and apply the same fix to the companion APIs. If your current fetch/XHR setup proves unreliable, I'll refactor it to use Axios or a lightweight Node proxy for cleaner header management and better error handling. I'll document the exact issue and solution in the code for future maintenance. I can start immediately.
$150 USD in 3 days
8.1
8.1

Fixing API authentication issues is a routine task for me. Whether it is an issue with token generation, header configuration, or handshake protocols between your server and the Parlay API, I can pinpoint the failure point in your code quickly. With over 15 years of experience in PHP, JavaScript, and Node.js, I frequently troubleshoot broken API integrations and server-side authentication flows. I am comfortable digging into your existing codebase to identify why the connection is failing and applying the necessary patch to restore functionality. I can resolve this for $123.94 within 1 days. Please share the error logs or the specific endpoint you are struggling to connect with, and I will get started immediately.
$123.94 USD in 1 day
8.1
8.1

With a keen eye for detail, extensive API development and integration skills, and proficiency in HTML, JavaScript, and PHP, I am confident that I can successfully resolve the authentication issue you are experiencing with the Parlay API. My dedication to understanding and solving complex problems in a clear and concise manner is what sets me apart. Though primarily specializing in WordPress, Magento, and Shopify websites, my skill set extends to include full-stack development. I have ample experience working with various APIs and ensuring seamless connectivity between different platforms. This makes me well-equipped to trace and resolve the specific problem that's causing your API key not to be recognized. Furthermore, I'm open to incorporating Axios or utilizing Node.js proxy if it allows for more efficient header management. My goal is not only to fix the authentication issue but also to ensure your entire API system operates smoothly. At the end of this project, you'll have a fully functional Parlay API integration with comprehensive documentation for easy future maintenance. Let's get your project back on track together!
$140 USD in 7 days
8.2
8.2

Hello, I can help with your "Fix Parlay API Authentication" project. I develop clean, maintainable PHP backends — core PHP and Laravel/Symfony, MySQL schema design, and well-structured REST APIs. For work involving php, javascript, html, node.js, api, api development, api integration, api testing, I pay close attention to validation, security, and readable code, delivering in small, testable milestones. You'll get clean commits and clear documentation. Could we discuss the specifics before I firm up the timeline? ⭐ 5.0/5 from a recent client: "Project was delivered before Time with Best professional Knowledge One could ever held. Thanks for the support" Final timeline and cost will be confirmed in chat after a complete understanding and documentation of the project expectations in detail.
$150 USD in 3 days
7.6
7.6

Hello, I can help fix the Parlay API authentication issue by reviewing your existing JavaScript and PHP code to find why the API key isn’t recognized. I will trace the handshake process, resolve the authentication error, and test successful data retrieval. After that, I can apply the same fix to your smaller companion APIs to ensure smooth integration. I’m comfortable working with API integration and testing using fetch/XHR or adding a Node proxy if needed for better header management. I will also document the changes clearly with comments so you can maintain the code easily. Do you already have the repository and error details ready for me to start? Best regards, Waqas & GoDesign Team
$199 USD in 3 days
7.4
7.4

Hello, I have fixed API authentication failures in plain HTML and JavaScript workflows where fetch or XHR sent keys in the wrong header, origin, or request format. Your Parlay issue sounds like a handshake problem, not a rewrite, and I can also check any PHP layer if the companion APIs touch one. I will inspect the current file, reproduce the exact error, correct the API Development flow, and confirm the expected payload returns. After that, I will apply the same logic to the smaller APIs and leave clear comments so future key or header changes are easy to maintain. Best regards, Teo
$200 USD in 2 days
6.8
6.8

Hi, I’ve reviewed your Parlay API issue and this is exactly the kind of JavaScript/API debugging I handle with confidence. Since your workflow is already built in HTML and uses fetch/XHR, I can trace the full authentication flow, inspect headers, request format, key handling, CORS/proxy behavior, and identify why the API payload is failing. If needed, I can implement a clean Node.js proxy or Axios-based adjustment so the handshake works reliably and your HTML frontend remains maintainable. I’ll also validate successful data retrieval, apply the same fix pattern to the companion APIs, and leave the code clearly commented so you can manage it going forward. I can start as soon as you share the repository, key details, and error response, with an initial diagnosis and working fix in 3 days. Would you like the final authentication fix to remain purely client-side, or should I harden it through a lightweight Node.js proxy for better header control and security? Best regards, KANIKA
$120 USD in 3 days
7.0
7.0

Hi there, I can help you troubleshoot and resolve the authentication issue with the Parlay API. By diving into your existing codebase, I will analyze the handshake process and identify why the API key isn't being recognized. Once fixed, I'll ensure the data can be pulled successfully and apply the same logic to your companion APIs as needed, keeping everything well-commented for your future maintenance. Your satisfaction is my priority and I guarantee that I will deliver you a high-quality result. Regards, Ali
$30 USD in 1 day
6.4
6.4

Hi, The Parlay API is failing because the key isn’t being passed correctly in the request headers—not because the key itself is wrong. I’ve encountered this before when integrating third-party APIs with strict header validation, where a single misplaced space or missing header format causes the rejection. I’d approach this using a lightweight Node proxy to handle headers consistently, since fetch/XHR can be finicky with header formatting and CORS when working directly in the browser. The proxy will also let us debug the exact request before it hits Parlay, so we can see exactly what’s being sent. I’ll test the fix against the exact error response you provide and make sure the changes are isolated to the authentication layer. Once it’s working, I’ll explain what went wrong in the comment and apply the same pattern to the companion APIs. This should get the API calls reliable without overhauling your existing workflow. I can start right now. Thanks, Denis.
$150 USD in 2 days
6.4
6.4

Hi. To fix the Parlay authentication flow, I’ll trace the request path in your HTML/JavaScript workflow, compare the actual headers and payload against Parlay’s expected handshake, and isolate where the key is being transformed, omitted, or blocked. I can also verify the response chain end-to-end, then apply the same auth pattern to the companion APIs so the whole workflow stays consistent. If the browser layer is limiting header control, I’ll switch the sensitive call to a lightweight Node proxy or clean Axios wrapper to keep auth reliable and maintainable. As a Senior Software Engineer, I have mastered JavaScript, fetch/XHR debugging, API authentication, and lightweight proxy integration, and have strong experience in browser-based workflow repairs, third-party API fixes, and production HTML app maintenance. I work cleanly with commented code so the next person can maintain it without guessing. I am sure I can deliver high-quality results within a short turnaround once I review the repo and the error response. Let’s get in touch and discuss more. Thanks.
$115 USD in 4 days
6.0
6.0

Greetings, I understand your frustration with the Parlay API authentication hurdle in your sports-oriented HTML workflow project. My expertise in PHP, JavaScript, and API development positions me well to tackle this challenge effectively. My approach involves a meticulous review of your existing codebase to identify and rectify the authentication issue with the Parlay API. I will ensure seamless data retrieval and extend the fix to related APIs for a comprehensive solution. With a structured plan, clean implementation, and rigorous testing, I aim to deliver a reliable and sustainable resolution. You can review my portfolio here: ⭐⭐ https://www.freelancer.com/u/CodeAnchors ⭐⭐ Before we proceed, could you clarify your top priority or ultimate business goal for this project? Let's discuss further in an open chat to finalize the scope smoothly. Best regards, Muhammad Anas Khan
$90 USD in 4 days
5.7
5.7

With your HTML-based sports-oriented workflow, the solution you need is just a few lines of code away. My name is Aliza Shaikh, and with over X years of experience as a Web & App Developer, I have wrestled with a fair share of API issues similar to what you're experiencing. The fact that I'm familiar with both the modern plain HTML/JavaScript stack as well as libraries like Axios and Node proxy makes me the ideal candidate to resolve this situation for you. Not only am I able to troubleshoot your authentication issue and get your Parlay API operational, but I can also seamlessly extend this expertise to tackle any companion APIs that follow similar patterns. Moreover, my keen eye on code maintainability will ensure that my repairs are clearly commented, making it easy for you to understand and manage every aspect of your project going forward. In addition to delivering elegant and functional technical solutions, I'm also known for clear communication, attention to detail, timely delivery, and unwavering support even after project completion. Your satisfaction is my primary goal. Choose me for an in-depth understanding of the problem and an elegantly conceptualized solution tailored specifically for your needs. Let's collaborate and transform your project into a reliable and high-performing reality.
$30 USD in 1 day
5.8
5.8

Hi, I am a JavaScript developer with 8 years of rich experience in software development. I am familiar with JavaScript, Node.js, HTML, API Integration, API Development, API Testing, and PHP. I can quickly identify the root cause of the Parlay API authentication issue by reviewing the request flow, headers, and authentication logic. Once the connection is working, I'll verify the API responses, apply the same fix to the related APIs, and leave the code clean, well-commented, and easy to maintain. I'm an individual freelancer and can work on any time zone you want. Please contact me with the best time for you to have a quick chat. Looking forward to discussing more details. Thanks. Emile.
$250 USD in 7 days
5.3
5.3

Hello there. I hope you are donig well. I have extensive experience in API integration and troubleshooting, having successfully resolved authentication issues in various projects. My background in both frontend and backend development equips me to navigate the complexities of your existing HTML/JavaScript codebase effectively. I understand that the main challenge is the failing authentication with the Parlay API despite using the correct API key. I will dive into your code to trace the handshake process, identify the issue, and implement a solution to ensure smooth data retrieval. I also aim to extend this fix to your companion APIs for consistency. I will provide a high-quality solution that not only resolves the immediate authentication issue but also ensures the code is well-commented for your future reference. My approach focuses on clarity and maintainability while leveraging best practices to enhance your API interactions. Please feel free to reach out to me. I look forward to working with you. Best regards, Billy Bryan
$30 USD in 3 days
5.4
5.4

Hello, We will trace your Parlay API handshake, fix the authentication failure, and extend the solution to your companion APIs. Common causes here: the key is sent as a query param instead of an Authorization header, or CORS blocks the preflight. We will inspect the exact error response, verify header placement, and test with a minimal fetch call first. If needed, a lightweight Node proxy will solve CORS cleanly. A couple of quick things to confirm: 1) Is the error a 401, 403, or a CORS preflight failure? 2) Are the companion APIs from the same provider or different ones? The number quoted here is a starting estimate. The exact cost and timeline will be confirmed after we go through the full scope together. Looking forward to your response. Best regards, Faizan
$90 USD in 5 days
5.6
5.6

Hello, I came across your project and it caught my interest. I have understood the issue and can get this fixed promptly. I'd love to discuss the requirements further and get started right away. Best regards, Fahad
$100 USD in 1 day
5.5
5.5

Authentication failures with sports APIs like Parlay usually come down to one of three things: the key needs to go in a specific header (not query params), there's a required Bearer/Basic prefix being missed, or CORS is blocking the preflight from a browser-based fetch entirely. That last one is the most likely culprit with a plain HTML/JS setup, since the browser won't let you send custom auth headers to a cross-origin API without a preflight the server allows. I'll trace the exact error response, fix the auth handshake, and once data flows I'll apply the same pattern to your companion APIs. If CORS is the blocker, a lightweight Node proxy (under 30 lines) is the cleanest fix and keeps your frontend simple. 1) Is the error a 401/403 from Parlay's server, or is it a CORS/network error in the browser console? Happy to talk details in chat. Shayan
$45 USD in 3 days
5.1
5.1

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