# Manual Payment Matching Feature - Implementation Summary

## What Was Added

A new feature that allows administrators to manually match unmatched M-Pesa payments to borrowers directly from the callbacks page.

## Changes Made

### 1. Backend Changes

#### `payments/views.py`
- **Modified `mpesa_callbacks` view**: Added borrowers list to context for the dropdown
- **Added `manual_match_payment` view**: New view to handle manual matching of payments to borrowers

#### `payments/urls.py`
- **Added new URL route**: `transactions/<uuid:transaction_id>/manual-match/`

### 2. Frontend Changes

#### `templates/payments/callbacks.html`
- **Added "Match Payer" button**: Appears in the "Who Paid" column for unmatched payments
- **Added manual matching modal**: Form to select and match a borrower
- **Added search functionality**: JavaScript to make borrower dropdown searchable
- **Added match button in details modal**: Alternative way to access matching feature

## How It Works

### User Flow
1. Admin navigates to `/payments/callbacks/`
2. Identifies payment marked with "⚠️ Not matched"
3. Clicks "👤 Match Payer" button
4. Modal opens showing:
   - Payment details (amount, phone, bill ref, time)
   - Searchable dropdown of all active borrowers
   - Warning about what will happen
5. Admin searches and selects the correct borrower
6. Clicks "Match & Process Payment"
7. System:
   - Links payment to borrower
   - Updates bill reference number
   - Processes payment automatically
   - Creates repayment if borrower has active loan
   - Shows success/error message

### Technical Flow
```
User clicks "Match Payer"
    ↓
Modal opens with borrower dropdown
    ↓
User selects borrower and submits
    ↓
POST to /payments/transactions/<id>/manual-match/
    ↓
manual_match_payment view:
    - Validates borrower selection
    - Updates transaction.borrower
    - Updates transaction.bill_ref_number
    - Adds processing notes with admin name
    - Calls transaction.process_payment(force_rematch=True)
    ↓
Redirects back to callbacks page with message
```

## Features

### ✓ Search Functionality
- Real-time search in borrower dropdown
- Search by name, ID number, or phone number
- Filters options as you type

### ✓ Payment Details Display
- Shows amount, phone, bill ref, and time
- Helps admin verify they're matching the right payment

### ✓ Audit Trail
- Logs admin username in processing notes
- Records who performed the manual match
- Tracks processed_by field

### ✓ Automatic Processing
- Automatically processes payment after matching
- Creates repayment if borrower has active loan
- Shows clear success/error messages

### ✓ Branch Filtering
- Respects branch filtering
- Only shows payments for selected branch

## Security

- ✓ Requires login (`@login_required`)
- ✓ Requires staff privileges (`@staff_member_required`)
- ✓ CSRF protection on form submission
- ✓ Validates borrower exists and has correct role
- ✓ Logs all manual matches with admin ID

## No Database Changes Required

This feature uses existing database fields:
- `MpesaTransaction.borrower` - Links to borrower
- `MpesaTransaction.bill_ref_number` - Updated to match borrower ID
- `MpesaTransaction.processing_notes` - Logs manual match
- `MpesaTransaction.processed_by` - Records admin who matched

**No migrations needed!**

## Deployment Steps

### For cPanel:
1. Upload these files:
   - `payments/views.py`
   - `payments/urls.py`
   - `templates/payments/callbacks.html`

2. Restart the application:
   - Go to "Setup Python App" in cPanel
   - Click "Restart" button

3. Test:
   - Visit `/payments/callbacks/`
   - Find unmatched payment
   - Click "Match Payer"
   - Select borrower and submit

## Testing Checklist

- [ ] Access callbacks page
- [ ] Verify "Match Payer" button appears for unmatched payments
- [ ] Click button and verify modal opens
- [ ] Verify borrower dropdown loads
- [ ] Test search functionality (type name/ID/phone)
- [ ] Select a borrower
- [ ] Submit form
- [ ] Verify success message
- [ ] Verify payment is now matched
- [ ] Verify repayment created (if borrower has active loan)
- [ ] Check processing notes show admin name

## Success Indicators

### Full Success
```
✓ Payment successfully matched to [Name] and processed! 
Receipt: [Receipt Number]
```

### Partial Success
```
⚠️ Payment matched to [Name] but no repayment created. 
Status: [Status]
```

### Error
```
✕ Payment matched but processing failed: [Error Message]
```

## Related Documentation

- **User Guide**: `MANUAL_PAYMENT_MATCHING_GUIDE.md`
- **Deployment Script**: `deploy_manual_payment_matching.py`

## Benefits

1. **Reduces Manual Work**: No need to manually create repayments in database
2. **Improves Accuracy**: Shows payment details to verify before matching
3. **Audit Trail**: Logs who performed the match
4. **User Friendly**: Search functionality makes finding borrowers easy
5. **Automatic Processing**: Handles repayment creation automatically
6. **Error Handling**: Clear error messages if something goes wrong

## Future Enhancements (Optional)

- Add bulk matching for multiple payments
- Add suggestion algorithm based on phone/amount
- Add confirmation step before processing
- Add ability to undo a match
- Add email notification to borrower when matched
- Add statistics on manual matches

## Support

For issues or questions:
1. Check `MANUAL_PAYMENT_MATCHING_GUIDE.md` for usage instructions
2. Verify borrower has active loan if repayment not created
3. Check Django logs for detailed error messages
4. Verify borrower account is active and role is "borrower"
