Incorrect response from hosting or acquiring

Budget: 800 UAH Deadline: 1 day

Good afternoon, I can sort out the payment logic in OpenCart and fix the incorrect verification of the Monobank acquiring status so that the client always lands on the correct page after a successful payment.
1. What version of OpenCart is being used?
2. Is there access to the admin panel and FTP/server (to check logs and code)?
3. What version/module of Monobank payment is installed (official or third-party)?
4. Is a callback (server-to-server) from Monobank used or just a redirect?
5. Is there access to error/request logs at the time of failure?

Budget: 2000 UAH Deadline: 1 day

Good afternoon, Viktor. According to the logs, I see the problem — mono_pay/response is called twice, and during the second call, Monobank returns a different status, causing the site to fail. I will fix it in one controller file: I will add a check "if the order is already paid — redirect to success immediately."

Budget: 1500 UAH Deadline: 2 days

Hello. I read the description, here the task looks like a quite specific bug in the chain after a successful payment. I can quickly check the logic of the callback and redirect, find out why part of the clients goes to fail after a successful payment, and fix it without unnecessary complications. If the reason is indeed in a faulty module, it will also become clear from the code right away.

Budget: 2000 UAH Deadline: 2 days

Hello, I did not see links to the fail page on the second screen.

I have been working with OpenCart for a long time and in depth, so it would be interesting to solve your problem.

Budget: 5000 UAH Deadline: 3 days

Good afternoon. Our specialists are engaged in integrating payment systems with OpenCart and are ready to fix the issue with redirects after payment. We will check the current payment module, set up correct handling of responses from Monobank, and ensure reliable order completion.

Budget: 700 UAH Deadline: 1 day

Good day.
I can fix this mistake.
If you have any questions, you can write to me in private messages.

Budget: 3000 UAH Deadline: 2 days

As a specialist in OpenCart 3 / OcStore, I have repeatedly configured acquiring and fixed errors in the order processing logic.

What I would look at in your case.

Log analysis: First, I will study system/storage/logs/ and the logs of the payment module itself to understand what response the verification script returns at the moment of redirection.
Callback check: We will ensure that the server correctly responds to the bank with "200 OK", otherwise the bank may send repeated requests, disrupting the session status.
Reinstalling the module: If the version with the "cracked" widget is confirmed, I will promptly replace it with the official module you purchased, transfer the settings, and test the payment chain on a test transaction.
I am ready to start the diagnostics right now. Let's discuss the details in the chat!

Budget: 3000 UAH Deadline: 1 day

Hello. I have extensive experience with OpenCart. I am ready to fix the problem.

Budget: 1500 UAH Deadline: 1 day

Good afternoon, most likely we will need to install a different payment module.

Budget: 2500 UAH Deadline: 1 day

Good day! I am ready to take on the task now. Write to me in private messages to discuss the details.