# Currency Support Implementation Guide

## Overview
This implementation adds multi-currency support to the TrustBeam Credit banking system, allowing each customer to have their own currency (USD, EUR, GBP, SEK, etc.) instead of a default $ currency.

## Database Changes

### 1. Add Currency Column to Users Table
Run the following SQL script to add the currency field to existing databases:

```sql
-- File: admin/add_currency_to_users.sql
USE nexus;

ALTER TABLE `users` 
ADD COLUMN `currency` ENUM('USD', 'EUR', 'GBP', 'SEK', 'CAD', 'AUD', 'JPY', 'CHF', 'NOK', 'DKK', 'PLN', 'CZK', 'HUF', 'BGN', 'RON', 'HRK', 'RSD', 'MKD', 'ALL', 'ISK', 'ARS', 'HKD', 'CNY', 'BRL', 'MXN', 'MYR', 'VES') DEFAULT 'USD' AFTER `balance`;
```

### 2. Supported Currencies
The system now supports 27 major currencies:

**North American Currencies:**
- **USD** - US Dollar (default)
- **CAD** - Canadian Dollar
- **MXN** - Mexican Peso

**European Currencies:**
- **EUR** - Euro
- **GBP** - British Pound
- **SEK** - Swedish Krona
- **NOK** - Norwegian Krone
- **DKK** - Danish Krone
- **PLN** - Polish Zloty
- **CZK** - Czech Koruna
- **HUF** - Hungarian Forint
- **BGN** - Bulgarian Lev
- **RON** - Romanian Leu
- **HRK** - Croatian Kuna
- **RSD** - Serbian Dinar
- **MKD** - Macedonian Denar
- **ALL** - Albanian Lek
- **ISK** - Icelandic Krona

**Asian Currencies:**
- **JPY** - Japanese Yen
- **HKD** - Hong Kong Dollar
- **CNY** - Chinese Yuan
- **MYR** - Malaysian Ringgit

**South American Currencies:**
- **ARS** - Argentine Peso
- **BRL** - Brazilian Real
- **VES** - Venezuelan Bolívar

**Other Currencies:**
- **AUD** - Australian Dollar
- **CHF** - Swiss Franc

## Updated Files

### 1. Database Schema
- **admin/database.sql** - Updated users table structure with currency field
- **admin/add_currency_to_users.sql** - Migration script for existing databases

### 2. Admin Panel
- **admin/create-user.php** - Added currency selection dropdown when creating new users

### 3. User Interface
- **dashboard.php** - Updated balance displays to show user's currency
- **profile.php** - Updated balance displays to show user's currency

## Implementation Details

### Admin User Creation
When admins create new users, they can now select from 20 different currencies. The currency field is required and will default to USD if not specified.

### User Balance Display
All balance displays throughout the application now show the user's specific currency:
- Dashboard header balance
- Dashboard balance card
- Profile page balance
- Account information sections

### Backward Compatibility
- Existing users without a currency field will default to USD
- All existing functionality remains intact
- No breaking changes to existing code

## Usage Examples

### Creating a User with EUR Currency
```php
// Admin creates user with EUR currency
$stmt = $conn->prepare("INSERT INTO users (..., currency, ...) VALUES (..., 'EUR', ...)");
```

### Displaying User Balance
```php
// Display balance with user's currency
echo $user['currency'] . number_format($user['balance'], 2);
// Output: EUR1,250.00
```

## Database Migration Steps

1. **Backup your database** before making changes
2. Run the migration script:
   ```bash
   mysql -u username -p database_name < admin/add_currency_to_users.sql
   ```
3. Verify the column was added:
   ```sql
   DESCRIBE users;
   ```
4. Update existing users' currencies if needed:
   ```sql
   UPDATE users SET currency = 'EUR' WHERE nationality = 'German';
   UPDATE users SET currency = 'GBP' WHERE nationality = 'British';
   ```

## Benefits

1. **Multi-Currency Support** - Each customer can have their preferred currency
2. **International Banking** - Support for European, North American, and other major currencies
3. **Flexible Admin Control** - Admins can assign appropriate currencies to users
4. **User-Friendly Display** - Users see their balances in their familiar currency
5. **Scalable Design** - Easy to add more currencies in the future

## Future Enhancements

- Currency conversion rates integration
- Multi-currency transaction support
- Currency-specific formatting (decimal places, symbols)
- Real-time exchange rate updates
- Currency-based transaction limits

## Testing

Test the implementation by:
1. Creating new users with different currencies
2. Verifying balance displays show correct currency symbols
3. Checking that existing users still work with USD default
4. Testing admin panel currency selection

## Support

If you encounter any issues:
1. Check database connection and permissions
2. Verify the currency column was added correctly
3. Ensure all PHP files are updated with currency references
4. Test with a fresh database using the updated schema
