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Getting Started

Installation​

Install the package via Composer:

composer require byjg/wallets

Database Setup​

This library requires a MySQL database. You can run the database schema using the provided SQL file:

mysql -u root -p your_database < vendor/byjg/wallets/db/base.sql

Or use ByJG Migration for database migrations:

vendor/bin/migrate up mysql://user:pass@localhost/dbname -path=vendor/byjg/wallets/db

Quick Start Example​

use ByJG\Wallets\Service\WalletService;
use ByJG\Wallets\Service\WalletTypeService;
use ByJG\Wallets\Service\TransactionService;
use ByJG\Wallets\Entity\WalletTypeEntity;
use ByJG\Wallets\Repository\WalletRepository;
use ByJG\Wallets\Repository\WalletTypeRepository;
use ByJG\Wallets\Repository\TransactionRepository;
use ByJG\Wallets\DTO\TransactionDTO;
use ByJG\AnyDataset\Db\Factory;

// Create database connection
$dbDriver = Factory::getDbInstance('mysql://user:pass@localhost/dbname');

// Initialize repositories
$walletTypeRepo = new WalletTypeRepository($dbDriver);
$transactionRepo = new TransactionRepository($dbDriver);
$walletRepo = new WalletRepository($dbDriver);

// Initialize services
$walletTypeService = new WalletTypeService($walletTypeRepo);
$transactionService = new TransactionService($transactionRepo, $walletRepo);
$walletService = new WalletService($walletRepo, $walletTypeService, $transactionService);

// Create a wallet type (e.g., USD)
$walletType = new WalletTypeEntity();
$walletType->setWalletTypeId('USD');
$walletType->setName('US Dollar Wallet');
$walletTypeService->update($walletType);

// Create a wallet for a user with an initial balance of $100.00 (10000 cents)
$walletId = $walletService->createWallet('USD', 'user-123', 10000, 2);

// Add funds: $50.00 (5000 cents)
$dto = TransactionDTO::create($walletId, 5000)
    ->setDescription('Deposit from bank account')
    ->setCode('DEP');
$transactionService->addFunds($dto);

// Withdraw funds: $30.00 (3000 cents)
$dto = TransactionDTO::create($walletId, 3000)
    ->setDescription('Purchase payment')
    ->setCode('PMT');
$transactionService->withdrawFunds($dto);

// Get wallet balance
$wallet = $walletService->getById($walletId);
echo "Available balance: " . ($wallet->getAvailable() / 100) . " USD\n";
// Output: Available balance: 120 USD

Core Concepts​

Scale and Integer Storage​

All monetary amounts are stored as integers (BIGINT) representing the smallest currency unit (e.g., cents for USD). The scale parameter determines how many decimal places:

  • scale = 2: Values in cents (1 USD = 100 cents)
  • scale = 0: Values in whole units (cryptocurrencies)
  • scale = 3: Values in thousandths (some currencies)

Example:

// Create wallet with scale=2 (cents)
$walletId = $walletService->createWallet('USD', 'user-123', 10000, 2);
// 10000 represents $100.00

// Create crypto wallet with scale=8
$cryptoWalletId = $walletService->createWallet('BTC', 'user-123', 100000000, 8);
// 100000000 represents 1.00000000 BTC

Balance Components​

Each wallet maintains three balance components:

  • balance: Total funds in the wallet
  • reserved: Funds held for pending transactions (blocked/reserved)
  • available: Funds available for use (balance - reserved)

Transaction Types​

  • B (Balance): Initial balance or reset
  • D (Deposit): Add funds immediately
  • W (Withdraw): Remove funds immediately
  • DB (Deposit Blocked): Reserve funds for future deposit (pending)
  • WB (Withdraw Blocked): Reserve funds for future withdrawal (pending)
  • R (Reject): Reject/reverse a reserved transaction

Next Steps​