PayU Integration Repair And Php Bugs Fixing

My PayU integration suddenly stopped handing control back to the site after payment—the redirect simply doesn’t fire. I need that flow restored so the transaction completes smoothly and users land on the success / failure pages as intended.

While you’re in the codebase there are a handful of additional PHP fixes I’d like wrapped up in the same session (it’s only four or five files):

• the main login tab isn’t responding after submission,
• a couple of admin screens throw blank pages instead of loading their content.

Code is plain PHP, no framework, hosted on cPanel. I’ll give you FTP + sandbox DB access so you can replicate the issue, patch, and push back. Please test with the PayU sandbox to confirm the redirect chain works end-to-end and leave clear comments around any edits so I can track them later.