Fixing the payment error of the online store

Budget: 15000 UAH Deadline: 15 days

Hello!
I have studied your task. The problem is clear: judging by the error, the software notifications on the server (in the files cod.php and voucher.php) are disrupting the payment process by sending an incorrect response to the browser. This explains the irregular nature of the failure.
Solution plan:
Code correction: I will eliminate the root cause of the problem in the specified files to ensure correct data exchange.
Server configuration: I will disable the output of system notifications for users and set up their logging for stability monitoring.
Comprehensive testing: I will conduct a full check of all payment methods on different devices and browsers, as you described in the task.
Please note: a small separate budget will be required for conducting real test transactions.
Cost and next steps:
I will be able to provide the exact budget and timeline after a brief audit of your project's code. For this, I will need access to the site (FTP/SSH and admin panel).
I am ready to start the audit and provide you with an accurate estimate.

Budget: 7777 UAH Deadline: 1 day

Good day!
I am interested in your project. I am a web developer with experience in the following technologies:
PHP, HTML, CSS, JavaScript, as well as Laravel, Vue.js, Alpine.js, WordPress, OpenCart.

I create responsive, fast, and user-friendly websites — both from scratch and based on CMS or frameworks.
I am ready to offer an optimal solution for your tasks.

We will determine the deadlines and cost after discussing the details.
The portfolio on the website is currently being prepared, but I can send examples of my work in private messages.

I would be happy to collaborate! Expand

Budget: 5000 UAH Deadline: 2 days

Good day, I have been working in this field for over 9 years, I have experience: php (symfony, laravel, OpenCart, wordpress), javaScript (vue, react, nuxt, nextJs, jquery), html, css (SASS/SCSS), sql (PostgreSQL, MySQL). I am ready to complete this project, efficiently and in a short time. Examples of recently completed projects: https://cohntm.com/ https://spacepro.org/ https://ff.ua/uk https://lingvanex.com/

Budget: 4000 UAH Deadline: 5 days

Good day! Write to me in private, we will discuss the details, accesses, etc... Thank you...

Budget: 1200 UAH Deadline: 2 days

Trust a professional with over 10 years of experience! The rate and deadlines are current! I look forward to collaboration! Experience in commercial development of online stores on CMS, business portals, and corporate websites - 11 years! +CMS: WordPress(+Woocommerce) PrestaShop/Opencart/Joomla/Bitrix/MODX/DLE/Shopify php/html/css/js/Mysql, PhotoShop/Figma Examples of work (from scratch, turnkey): https://wildandorganic.com/ https://cryptosignals.org/ https://ecnbot.com https://locs-ua.com/ https://www.grower.com.ua/ https://www.alternativemedicine.com.ua/ https://silkkiss.ua/ https://nordtrade.online/ https://v12coffee.com.ua/franchise/ https://smrtalgo.com/ https://sengero.no/ https://beautybysim.no/ https://sonatagalleri.com/ https://www.solmy-realestate.com/ https://www.emmanuel.com.ua/ https://www.onsitecomputersinc.com/ https://express-tehbud.com/ https://korostenporcelain.com.ua/ https://sladok.com.ua/ https://pricemds.com/ https://picupmedia.com/ https://www.serasar.com/

Budget: 8000 UAH Deadline: 2 days

According to the log, the problem is related to incorrect processing of the JSON response and the missing order_id in the payment module — which causes the server to return an HTML Notice instead of a correct JSON, and the front end throws a SyntaxError: Unexpected token '

Budget: 2000 UAH Deadline: 2 days

Good day, my experience is over 12 years, I know OpenCart very well, I understand what the mistake is, I can solve it, feel free to contact me.

Budget: 27000 UAH Deadline: 10 days

Hello.
I have extensive experience in troubleshooting and optimizing OpenCart payment systems integrated with gateways such as LiqPay, WayForPay, and Fondy, ensuring seamless and secure transactions. Your project aims to reproduce irregular payment errors and stabilize all payment methods, which perfectly aligns with my experience in debugging payment gateways, analyzing logs, and verifying API integration. I can methodically analyze server logs, module configurations, and callback mechanisms to identify the root cause of failed or incomplete transactions. Once the issue is identified, I will resolve it, check the integrity of SSL and API, and ensure the correct update of the order status after successful payment. Finally, I will conduct comprehensive payment testing on multiple devices and across different browsers to ensure stable and error-free operation.

Budget: 2000 UAH Deadline: 2 days

Hello! Your site is on OpenCart, I can solve this problem without costing you a fortune :)

Budget: 5000 UAH Deadline: 3 days

Over 15 years of experience, including with OpenCart. I see what the cause of the error is and can fix it.

Budget: 2200 UAH Deadline: 1 day

Hello. I know OpenCart well. I have questions regarding your task. We need to discuss. Please contact me.

Budget: 3000 UAH Deadline: 2 days

Hello, I can solve your problem. .. Feel free to contact me............

Budget: 6000 UAH Deadline: 7 days

Good afternoon!
The error is related to the server returning HTML notifications from PHP instead of a correct JSON response.
In particular, the variable order_id is not defined when placing an order, and there is also an error accessing the array in the voucher module.

I can reproduce the problem, make corrections to the payment controllers and data validation, as well as check the operation of all payment modules after the fixes.