Test Refund Request - String Generator Only

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out_trade_no: TEST-202601120001 (₦600 total)

How to use:
1. Change amount/reason if needed
2. Click "Generate Concatenation String"
3. Copy the full string shown below
4. Paste into https://www.md5hashgenerator.com → get MD5 (lowercase)
5. Convert to UPPERCASE (vendor requires uppercase)
6. Paste uppercase MD5 into "Signature (sign)" field
7. Submit form