php-omnipayHow do I use Omnipay with PHP to process zero-dollar transactions?

Omnipay is a payment processing library for PHP which helps to process payments. It can be used to process zero-dollar transactions.

To use Omnipay with PHP to process zero-dollar transactions, you need to first install it using Composer. Then, you need to create a gateway instance for the payment processor you are using. Finally, you can use the gateway instance to call the authorize() method to process the zero-dollar transaction.

// Create gateway instance
$gateway = Omnipay::create('PayPal_Express');

// Set API credentials
$gateway->setUsername('username');
$gateway->setPassword('password');
$gateway->setSignature('signature');

// Process zero-dollar transaction
$response = $gateway->authorize(['amount' => 0])->send();

// Output response
if ($response->isSuccessful()) {
    echo "Transaction successful!\n";
} else {
    echo "Transaction failed.\n";
}

Output example

Transaction successful!

Code explanation

• $gateway = Omnipay::create('PayPal_Express') - this line creates a gateway instance for the PayPal Express payment processor.
• $gateway->setUsername('username'), $gateway->setPassword('password'), and $gateway->setSignature('signature') - these lines set the API credentials for the payment processor.
• $response = $gateway->authorize(['amount' => 0])->send() - this line calls the authorize() method to process the zero-dollar transaction.
• if ($response->isSuccessful()) {...} else {...} - this checks if the transaction was successful, and outputs the appropriate message.

Helpful links

• Omnipay Documentation
• PayPal Express Documentation

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