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1. Installation

Install the SDK via Composer: 
composer require lettermint/lettermint-php

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2. Send your first email

Initialize the client with your API token: 
<?php

require_once 'vendor/autoload.php';

$lettermint = new Lettermint\Lettermint('your-api-key');
Send your first email: 
$response = $lettermint->email
    ->from('John Doe <john@yourdomain.com>')
    ->to('recipient@example.com')
    ->subject('Hello from Lettermint!')
    ->text('Hello! This is a test email.')
    ->send();

echo "Email sent with ID: " . $response->id;

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3. Email Features

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Basic Email

Send a simple text or HTML email: 
$lettermint->email
    ->from('John Doe <john@yourdomain.com>')
    ->to('recipient@example.com')
    ->subject('Your acount is ready!')
    ->html('<h1>Welcome!</h1><p>Thanks for signing up.</p>')
    ->text('Welcome! Thanks for signing up.')
    ->send();

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Multiple Recipients

Send to multiple recipients using CC and BCC: 
$lettermint->email
    ->from('John Doe <john@yourdomain.com>')
    ->to('user1@example.com', 'user2@example.com')
    ->cc('manager@yourdomain.com')
    ->bcc('archive@yourdomain.com')
    ->subject('Monthly Newsletter')
    ->html('<h1>This Month\'s Updates</h1>')
    ->send();

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Custom Headers and Reply-To

Add custom headers and set reply-to addresses: 
$lettermint->email
    ->from('support@yourdomain.com')
    ->to('customer@example.com')
    ->replyTo('help@yourdomain.com')
    ->subject('Support Ticket #12345')
    ->headers([
        'X-Priority' => '1',
        'X-Ticket-ID' => '12345'
    ])
    ->html('<p>Your support ticket has been updated.</p>')
    ->send();

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Metadata

Add metadata for tracking and webhook payloads: 
$lettermint->email
    ->from('notifications@yourdomain.com')
    ->to('user@example.com')
    ->subject('Order Confirmation')
    ->metadata([
        'order_id' => '12345',
        'customer_id' => 'cust_789',
        'campaign' => 'order_confirmation'
    ])
    ->html('<p>Your order has been confirmed.</p>')
    ->send();
Metadata is included in webhook payloads but not added to the actual email headers. Use it for tracking and analytics purposes.

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File Attachments

Attach files to your emails: 
// Read file content
$fileContent = file_get_contents('/path/to/document.pdf');

$lettermint->email
    ->from('invoices@yourdomain.com')
    ->to('customer@example.com')
    ->subject('Your Invoice')
    ->html('<p>Please find your invoice attached.</p>')
    ->attach('invoice.pdf', base64_encode($fileContent))
    ->send();

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4. Response

$response = $lettermint->email
    ->from('John Doe <john@yourdomain.com>')
    ->to('recipient@example.com')
    ->subject('Test')
    ->text('Hello!')
    ->send();

echo $response->message_id; // Email ID
echo $response->status;     // Current status

GitHub Repository

Find the complete source code, report issues, or contribute on GitHub.
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