Payment processing error via API
16 USD -
1 day20 USD
1 day20 USD
Good day.
I have familiarized myself with the task. I can help find the cause of the 400 error when processing the payment through the API and fix it. I will check the request itself, the data provided, headers, authorization, and the processing logic. After identifying the cause, I will make the correction and check to ensure everything works correctly. I work with Python projects and API integrations, so such tasks involving diagnostics and error correction are familiar to me.
Cost: 900 UAH
Deadline: 1 day
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1 day16 USD
1 day16 USD
Good day.
I can quickly connect and find the reason for the error when uploading the payment via the API.
What I will do: I will check the request itself, the data structure, headers, authorization, field validation, payload format, and the logic on the processing side to understand why exactly a 400 error occurs. After that, I will fix the cause and bring the request to a normal working submission.
Such errors often occur due to incorrect data format, missing mandatory fields, incorrect serialization, request signature, or discrepancies with the API documentation — this is exactly what can be quickly caught and fixed.
Regarding the budget, 700 UAH is fine, I can take it on.
… As for the timeline — if there is access to the code, the error message, and an example of the API request/response, then usually such tasks are resolved quickly.
If needed, I can not only fix it but also briefly show what the cause was so that it does not happen again in the future.
Similar completed project: Senior Python Architect / Tech Lead (High-Load TDS: Litestar + Granian)
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1 day16 USD
1 day16 USD
Error 400 in the API often hides not in the request itself, but in one of the fields, data format, or processing logic. I will quickly find the source of the failure, check the payload, validation, and response processing, after which I will fix the cause and test to ensure that payments are loaded correctly without errors. I have experience with bots, scripts, and automation, so I work carefully with details and bring it to a stable result. I am ready to take on the task and figure it out quickly.
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1 day16 USD
150 1 day16 USD
Hello! I am ready to quickly find the cause of the error and fix the operation of your API. I have experience working with payment gateways and integrating third-party services in Python.
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1 day22 USD
962 45 0 1 day22 USD
Good day, I am ready to fix the mistake. I have experience working with Python and project support.
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1 day16 USD
456 1 day16 USD
Hello, I can do it. Please write in private which acquiring or gateway is used.
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5 days16 USD
242 5 days16 USD
Good day!
I have experience working with APIs and processing payment integrations (REST, JSON, authorization, request validation).
🔹 **What I will do:**
* analyze the request that causes a 400 error (headers, body, parameters)
* check compliance with the API documentation
* find the reason (validation, data format, authorization, incorrect fields, etc.)
… * correct the request or the logic of data formation
* test to ensure the payment goes through without errors
🔹 **Approach:**
I will start with the logs and reproducing the error, then proceed with step-by-step debugging (Postman / curl) to accurately determine at which stage the problem occurs.
🔹 **Experience:**
I have worked with payment APIs and integrations, including handling 4xx/5xx errors and resolving them.
I am ready to quickly connect and solve the problem.
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1 day16 USD
2964 14 0 1 day16 USD
Good day.
Error 400 usually indicates a problem with data validation on the client side, such as an incorrect request body format or missing required fields. I am ready to connect to the project, analyze the parameters being sent, and the backend logic to quickly find and resolve the issue. Since my main stack is Node.js and TypeScript, I will quickly understand the structure of your API and fix this problem. Please message me privately to agree on the details and transfer access.
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1 day16 USD
656 9 0 1 day16 USD
Good day, Yaroslav!
In general, the task is clear, but for an accurate response regarding the deadlines and price, I would like to clarify some questions that arose after analyzing your task.
Please write in private messages – we will discuss the details and your wishes.
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1 day16 USD
91 1 day16 USD
Hello. Most likely, the error is related to incorrect request parameters or authorization (400 is often due to this). I can quickly check the logs, the request, and fix it.
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1 day16 USD
355 1 0 1 day16 USD
Hello! According to the message, the error occurs due to multiplying a float by the Odoo ORM object res.currency instead of its numeric value. It is necessary to either add .rate or explicitly convert to float - depending on the context of the code.
The fix will take 1-2 hours after gaining access to the code. I am ready to take it on soon.
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1 day16 USD
1495 13 0 1 day16 USD
Hello! I can implement it. Write to me privately to discuss all the details. I will be glad to cooperate!
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1 day16 USD
296 1 day16 USD
Good day!
I am ready to quickly complete the task. The problem is likely typical and related to incorrect formation of the request body, therefore its resolution will not require much time.
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1 day89 USD
172 1 1 1 day89 USD
Good day. I am ready to complete this project as I have extensive experience in application development.
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1 day16 USD
1801 4 0 1 day16 USD
Hello, I have extensive experience in Python development. I am ready to identify the problem and fix it in a short time. I suggest discussing the details in private messages.
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1 day16 USD
507 3 0 1 day16 USD
Hello! I understand, I will fix it. I have a lot of experience working with APIs mainly in Python.
Please write to me and tell me more about the problem.
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1 day22 USD
1887 8 0 1 day22 USD
Hello!
The Dev Company team is ready to engage in diagnosing and fixing the 400 error when uploading a payment via the API.
What we will do:
- Analyze the logic of your API call (backend + front / integration), check the request bodies, headers, authorization, and schema validation;
- Reproduce the 400 error, capture logs/traces, determine the exact cause (incorrect data, format, routing, middleware, limitations from the payment provider, etc.);
- Make corrections to the code/config (backend, SDK, integration layer), add proper error handling and logging;
- Test positive and negative scenarios to ensure the API works stably without 400 errors in standard cases.
…
We have experience in integrating payment systems, building APIs, and debugging errors (including 400/401/422) in production projects. After gaining access to the repository and environment, we will be able to assess the scope of work and provide specific timelines.
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1 day16 USD
93 1 day16 USD
Good day, I am ready to complete the work, please provide more information.
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1 day16 USD
2241 35 0 1 day16 USD
Good day, Yaroslav, I need more details about what the payment is, which API, and so on. Write to me privately, I will take a look.
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1 day16 USD
2263 25 1 1 day16 USD
Hello, please send the personal details of the request you are working on and the snippet of code in which it occurs, we will immediately solve your problem and I will explain the reason for the error. I will be happy to collaborate!
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3 days16 USD
726 9 1 3 days16 USD
Hello! Your project caught my attention. I am ready to start working and ensure high quality execution.
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1 day28 USD
9340 20 0 1 1 day28 USD
Hello, I can help you. Please contact me. I will review the request and correct the mistake.
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1 day22 USD
3426 10 0 1 day22 USD
Good day!
I have familiarized myself with the task description.
I can help: I will find the cause of the 400 error when working with the API, fix it, and check the correctness of payment processing so that requests go through without errors.
I can connect and start soon.
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1 day22 USD
681 22 0 1 day22 USD
Hello. I am engaged in the integration of payment systems. I am ready to solve your problem with the payment system API. Feel free to contact me.
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1 day22 USD
1070 30 0 1 1 day22 USD
Good day. I am ready to find and fix errors in payment processing. Experience of more than 10 years. I will be happy to collaborate.
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1 day22 USD
9984 117 0 1 day22 USD
Hello.
I am a NodeJS developer. I have experience with payment systems. I am ready to take on the task. Write to me, we will discuss.
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3 days16 USD
612 21 0 3 days16 USD
Hello! I can do your project. I have experience. Write to me, and we will agree.
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1 day16 USD
3392 84 0 1 day16 USD
Ready to take it on. Need to clarify the details of the order, write! Using python, uv, github, docker.
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1 day22 USD
6262 74 1 1 day22 USD
Good day. I have extensive experience with similar tasks. A more detailed specification is needed. I will be happy to help.
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1 day21 USD
615 3 0 1 day21 USD
Hello.
The error indicates that the problem is likely in the currency rate processing: instead of a numerical value, the object `res.currency.rate` is being used somewhere in the calculation, which is causing the multiplication to fail.
I can quickly localize the error location, reproduce the scenario, fix the calculation, and check that the API works correctly without a 400 error.
Before starting the work, I need to clarify:
- access to the code or repository
- where exactly the payment processing occurs
… - if the error can be reproduced in the test environment
I am ready to take this on immediately and quickly resolve this bug.
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1 day78 USD
95878 1272 1 10 1 day78 USD
Hello. I have extensive experience in website development. Can I take a look at the website?
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1 day16 USD
667 5 0 1 day16 USD
Hello! I am interested in your project. I have extensive experience in:
📊 Data processing: working with databases, structuring and analyzing information, automating the processing of large volumes of data, import/export and validation;
🤖 Automation and emulation of user actions, development of bots of varying complexity;
⚡️ Asynchronous and multithreaded parsing: collecting and processing data with performance optimization;
🔍 OCR and text search: recognition and structuring of information;
🖼 Media processing: working with images and multimedia;
🖥 Software development, desktop applications, system services and utilities;
📱 Mobile development: native and cross-platform applications;
… 🌐 Working with APIs and third-party services: integration, automation, and data exchange;
🗣 Translation and text processing: automation of translation, working with language models and text analytics;
🤖 AI/LLM solutions: integration and use of artificial intelligence, working with language models and automating intelligent processes.
I will complete the work quickly and efficiently. Contact me to discuss the details and deadlines of the project!
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1 day16 USD
195 1 day16 USD
I have experience working with APIs and error handling (specifically 400 Bad Request). Usually, such issues are related to incorrect request parameters, data validation, or payload format.
I can:
- analyze the request (headers, body, data format)
- check compliance with API documentation
- find the cause of the error
- fix and test correct operation
If necessary, I will add logging for further monitoring.
…
I am ready to quickly connect and resolve the issue.
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1 day18 USD
1328 35 1 1 day18 USD
Hello. Extensive experience working with various APIs and payment systems. Feel free to contact me.
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1 day17 USD
536 3 0 1 1 day17 USD
Hello! Error 400 Bad Request usually indicates an incorrect request structure or a mismatch of data types with the API requirements.
My resolution strategy:
I will analyze the request log and server response to identify the specific field causing the error.
I will check the validity of the JSON structure and the presence of all required headers.
I will test the request through Postman to confirm the fix, and after that, I will make adjustments to the code.
I am ready to start now if you provide access to the code and API documentation. In terms of time, this will take from 1 to several hours depending on the detail of the logs.
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2 days22 USD
1945 7 0 2 days22 USD
I will connect and quickly figure out why the API returns 400 when uploading the payment: I will check the request itself, mandatory fields, data format, headers, authorization, and logic on the endpoint side.
What is included: finding the cause of the error, a targeted fix, checking with a real request, and confirming that the method works again.
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1 day25 USD
1770 20 0 1 day25 USD
I have worked with many different payment systems. Please write the details in private messages.
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в минулій публікації, ви хоч скрин помилки додавали, та назву сервісу, а зараз зовсім ребус якись.
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Можете, будь ласка, вказати конкретніше стек та текст помилки тут або в пп? Це важливо для розуміння суті задачі
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Судячи зі скріншоту з попереднього проєкту, в API передаються некоректні дані.. треба або перевірити, що подається до API, або додати опрацювання даних такого типу. Цікавить стек API, щоб знати напевно, чи це мені під силу
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