dLocal API callback return error "Invalid credentials"

@a4logic

Hello, As a highly experienced developer, I have worked on numerous projects using dLocal and other similar API systems. I have an in-depth understanding of the platform's functionalities, including how to handle complicated errors like the one you are currently facing - "Invalid credentials". My solid background in JavaScript and PHP allows me to navigate these complexities with ease, ensuring that your code is both valid and optimized for success. At Our Software, we prioritize client satisfaction and delivering results, which is why our team consistently incorporates the latest technologies into our development process. We also emphasize positive feedback, excellent customer service, and timely project delivery. With us, your project will be given the attention it needs and deserves. Don't miss out on an opportunity to work with a team that can skillfully resolve your dLocal API callback issues. Choose us to ensure your code is not only validated but ready for seamless operation. Let's bring those "Miracles" to life! Thanks!

@dfordesigners

Hi there, I specialize in API development and have extensive experience working with various APIs, including dLocal. I have successfully resolved similar issues with API callbacks before, ensuring smooth functionality. With a keen eye for detail, I can quickly identify and rectify the "Invalid credentials" error in your dLocal API callbacks. Rest assured, I will thoroughly validate your existing code to ensure seamless integration. Let's discuss your project further to streamline the process and get your API callbacks back on track. Looking forward to collaborating with you on this project. Thank you.

@kamran2012

Hello there, I will debug the dLocal callback authentication and resolve the "Invalid credentials" error. This typically comes down to how the HMAC signature is being verified on the callback — either the X-Secret-Key header is mismatched, the signature is computed against the wrong request body encoding, or the API key/secret pair differs between live and sandbox environments. Questions: 1) Are you seeing this on sandbox, production, or both? 2) Which backend language handles the callback endpoint? Looking forward to talking through the details. Kamran

@Herculesz

Hi I have experience working with payment gateway API integrations and can help debug the dLocal callback issue showing “Invalid credentials.” The main technical problem is likely related to callback authentication, webhook signature validation, wrong API keys, environment mismatch, merchant credentials, or incorrect header/payload handling. Since your code is already ready, I can focus only on validating the current dLocal setup and finding why callbacks are failing. I can review the webhook endpoint, callback credentials, signature/hash generation, sandbox/live configuration, request headers, IP/security settings, and server logs. I can also test the callback flow end to end and confirm whether the issue is in your code, dLocal dashboard settings, or credential configuration. My goal is to fix the authentication failure without changing the rest of your payment logic unnecessarily. I will provide a clear summary of the cause and the exact changes made so your team can maintain it later. Thanks, Hercules

@giaphung2k1

Hello Hi there It sounds like you're facing a critical issue with DLocal callbacks failing, which is likely causing significant disruptions. With my experience in API integrations and payment gateway troubleshooting, I can quickly diagnose and resolve these callback problems to ensure your system runs smoothly. Let's chat about getting this fixed for you. Giáp Văn Hưng

@eliaa

Hello, I see you’re facing an “Invalid credentials” error with dLocal API callbacks, which usually points to authentication or configuration issues within your integration. The tricky part is ensuring the exact credentials match what dLocal expects while handling secure token refreshes if needed. With 10+ years working with PHP backends and APIs, especially in Laravel and native PHP, we can quickly identify and fix these errors to restore smooth payment flows. You can check samples from our work at https://www.freelancer.com/u/eliaa. Looking forward to hearing from you. Best Regards, Elia Fawzy.

@teodorgeorge

Hello, I’ve worked with dLocal integrations before and can help pinpoint why your callback validation keeps returning invalid credentials. I’ll review your existing Django and PHP code to make sure the signature and headers match exactly what dLocal requires. I’ll keep it simple and focus only on validating and fixing the callback flow so your system starts receiving proper responses again. Thanks, Teo

@anirudhat

Hi, I've worked extensively with the dLocal payment gateway and the "Invalid credentials" error on callbacks is something I've debugged before — it's typically caused by a mismatch between your X-Login, X-Trans-Key, or the Secret Key used for HMAC signature validation on the notification endpoint. My approach would be to first verify your API credential configuration across environments (sandbox vs production), then inspect the callback signature verification logic in your code to ensure the correct secret key is being used to validate dLocal's webhook signatures. I'll also check if there's a recent API version change affecting the authentication headers. I can start working on this right away — since your code is already in place, this should be a focused and quick fix.

@durgesh8527

With over a decade of coding experience along with proficiency in JavaScript, MySQL, and PHP, I assure you that I have the capability and expertise needed to debug your dLocal API callback issue. My proven track record of delivering 100+ successful projects globally testifies to my ability to not just identify but also correct issues swiftly, saving time and reducing back-and-forth discussions. Additionally, my broad range of technical skills and stack knowledge such as Node.js, Laravel, React Native, among others make me adaptable and capable of handling diverse projects. My familiarity with REST APIs and third-party services is especially relevant to this engagement since it revolves around identifying the cause of 'Invalid credentials' error message and addressing it accordingly. I have a deep understanding of backend systems and database architecture which enables me to effectively validate your existing code before deployment. Lastly, I differentiate myself with my commitment to clear communication, quick responses, and on-time delivery. My work ethic is focused on efficient project handling which includes understanding your unique needs precisely and providing solutions that are both scalable and user-friendly. I appreciate the opportunity to work with you on this project and assure you of my unwavering dedication towards resolving your dLocal API callback issue accurately. Let's connect and get started right away!

@temoberishvili

Hello! I carefully read your project description regarding the "Invalid credentials" error with the Dlocal API callbacks, and I understand how crucial it is to resolve this issue promptly. I have over 10 years of experience in API development and integration, which has equipped me with the skills necessary to troubleshoot and rectify such problems effectively. To ensure I grasp the project requirements fully, could you please clarify the following questions to help me better understand the project? 1. Have you already identified any specific changes or configurations that led to this error, or is this a new issue? 2. What is the overall scope of the project? Are there additional functionalities you’d like to develop alongside fixing the API issue? I've worked on similar projects, including a payment integration for an e-commerce platform, an API-driven inventory management system, and a custom CRM that involved multiple third-party APIs. Each project aimed to enhance user experience and operational efficiency, aligning perfectly with your goal. I’m genuinely interested in helping you resolve this issue and am confident that my expertise makes me the right fit for your project. Looking forward to your response! Best regards.

@AZTURK1

Hi there, I understand dLocal callbacks are returning “Invalid credentials” while your PHP/JS/Django stack and MySQL DB hold the integration logic; I’ve debugged dLocal HMAC/credentials and webhook auth flows before so I can validate your current code and environment safely. - Verify and fix dLocal signature/auth: inspect callback headers, validate HMAC secret, and correct credential parsing in your PHP/JS/Django handlers. - End-to-end test and deployment: create reproducible test callbacks, update credential storage, and deploy the validated fix to staging with logs. - Reproduce fix and optional hardening: add signature verification unit tests and strict header validation in webhook handlers. - Risk/quality-control: backup checkpoint + post-fix validation with a staged deployment and rollback plan. Skills: ✅ dLocal API ✅ PHP / JavaScript / Django ✅ Webhook signature validation ✅ Deployment / VPS / hosting ✅ Security: HMAC/credentials hardening Certificates: ✅ Microsoft® Certified: MCSA | MCSE | MCT ✅ cPanel® & WHM Certified CWSA-2 I’m available to start immediately; Is this running on a live production server and can you share a single raw failing callback (headers + body) and which credential storage (env, DB, secrets manager) you use? Best regards,

@DigitalLogics

Hi there, If all callbacks are returning “Invalid credentials” while the rest of the flow is working, this is almost always a signature/auth mismatch or environment inconsistency rather than a core integration issue. I’ve handled payment gateway callbacks where the failure point is subtle, usually incorrect secret usage, header mismatch, payload encoding differences, or test vs live key conflicts. I’ll go straight into validating your webhook signature logic, headers, and request formatting against Dlocal’s expected verification method, then trace the callback lifecycle to pinpoint exactly where it breaks. Since your code is already in place, I won’t rebuild anything, just isolate the fault, fix the validation layer, and confirm callbacks are being accepted and processed correctly. This is a quick, focused fix if approached properly. If you want it resolved without trial and error, I can jump in and validate it right away. Best; Zaman

@johnallenvillan1

Hi, I noticed your issue with every dLocal callback returning “Invalid credentials,” which tells me the problem is likely in the signature validation or header parsing rather than your core Django or PHP logic. I’ve handled this exact failure mode before while stabilizing a multi-currency payment flow where I resolved mismatched HMAC generation and timestamp drift issues. The real risk here is that dLocal is strict about canonicalization of payloads and the generation of the signature from raw request bodies. Even small middleware transformations, encoding differences, or missing headers can trigger that “Invalid credentials” response. I’ll trace the exact signing workflow, inspect how your server receives the raw callback body, and validate the HMAC against dLocal’s expected format. I’ll also run controlled callback simulations to pinpoint whether the failure is in header extraction or payload integrity. Before I begin, I need to confirm how your server is handling raw request buffering and whether any proxy or CDN is modifying callback data. I can resolve this quickly once I have access to the callback logs and signing logic. Thanks, John allen.

@juanjosec63

Hi, I have gone through your project description and understand you’re facing an "Invalid credentials" issue with dLocal API callbacks and need someone to debug and fix the authentication flow without changing the existing logic. I have hands-on experience working with payment gateway integrations and API callbacks, including debugging auth issues like signature mismatch, header validation, and credential configuration. I’ve worked with PHP, Django, and REST APIs where callback validation and security checks are critical. I will review your callback implementation, verify API keys, headers, signatures, and endpoint configuration, then fix the credential validation issue so callbacks are accepted correctly and processed without errors. Best regards, Juan

@kapilasl

Hello, I am senior developer and server administrator. I already have experience with more payment platform API integration. Unfortunately I have not experience with dLocal API. But i can fix your Invalid credentials issues. The issue should be callback APIs is almost always a configuration/authentication mismatch Thank You

@FizzaNadeemK

Hi, resolving your dLocal callback “Invalid credentials” errors to ensure all API callbacks function correctly is exactly my focus. I see your code is ready and only validation is needed, which fits my 7+ years full stack web development and payment integration experience. I will verify API credentials, test callbacks, and ensure dLocal responses are correctly authenticated so your payments flow without errors. Can you confirm whether the issue occurs in sandbox, production, or both environments? Best Regards Fizza Nadeem K

@codefusion53

Hi This looks like a classic Dlocal authentication or signature validation issue, especially around callback handling. I can quickly review your existing implementation, verify headers, credentials, and signature logic, and pinpoint exactly why the API is returning invalid credentials. I will trace the request flow, validate environment configuration, and ensure correct authentication format including keys, hashing, and endpoint usage. Once identified, I will apply a minimal fix without restructuring your codebase. You will receive a clear explanation of the root cause, corrected code, and steps to test callbacks successfully in both sandbox and production. I can also help verify webhook security and edge cases if needed. Best, Justin

@billybryan98

Hello, I’ve worked extensively with payment APIs and fee/credential validation across Django, PHP, JavaScript, and MySQL stacks. I understand why dLocal callbacks show “Invalid credentials” and I’ll approach this as a focused debugging task: confirm API keys and environment, ensure the signatures and host/IP addresses are whitelisted, verify the callback URL, and implement robust server-side validation that checks the payload against dLocal’s expected signature before processing. With hands-on experience in API integration and secure callback handling, I’ll audit your existing integration, reproduce the issue in a safe sandbox, and deliver a minimal, reliable fix package. I’ll document the changes and add quick tests to prevent regressions, so you can deploy with confidence. I can handle this work based on my expertise and past experiences. I’ll keep the solution simple, precise, and effective, ensuring you get a clean, working callback flow. Please feel free to contact me so we can discuss more details. I am looking forward to the chance of working together. Best regards, Billy Bryan

@techsty2014

Hi, I have worked with dLocal. 'Invalid credentials' on the callback side almost always means an HMAC signature mismatch, not a key error: webhook verification uses a different secret than the X-Login/X-Trans-Key pair used for outgoing API calls, and the signature is HMAC-SHA256 over X-Login + X-Date + body. I will check the secret pairing, date format, and raw body bytes. Questions: 1) Sandbox or production environment, or both? 2) Stack on the receiving side: Django, Node, or PHP, and is the body read raw or after middleware? Ready to start whenever you are. Faizan