$syncer = new \Otomaties\WpSyncPosts\Syncer('post');

$externalPosts = [
	[
		'title' => 'API post 1 title',
		'id' => 'api-post-1',
	],
	[
		'title' => 'API post 2 title',
		'id' => 'api-post-2',
	],
];

foreach ($externalPosts as $externalPost) {
	$args = [
		'post_title' => $externalPost['title'],
		'meta_input' => [
			'external_id' => $externalPost['id'],
		],
	];

	$existingPostQuery = [
		'by' => 'meta_value',
		'key' => 'external_id',
		'value' => $externalPost['id'],
	];

	$syncer->addPost($args, $existingPostQuery);
}

$syncer->execute();

$args = [
	'post_title' => $externalPost['title'],
	'meta_input' => [
		'external_id' => $externalPost['id'],
	],
	'media' => [
		[
			'url' => $externalPost['thumbnail']['url'],
			'featured' => true,
            'date_modified' => gmdate('Y-m-d H:i:s', $externalPost['thumbnail']['date_modified']), // If this field changes, the old media gets deleted and the new one is downloaded
		],
		[
			'url' => $externalPost['floor_plan']['url'],
            'date_modified' => gmdate('Y-m-d H:i:s', $externalPost['floor_plan']['date_modified']),
			'key' => 'floor_plan', // You can get this media using get_post_meta($postId, 'floor_plan', true);
			'group' => 'documents' // You can fetch all media for this post in this group using get_post_meta($postId, 'documents', true); Defaults to 'synced_images'
		],
	],
]

$args = [
	'post_title' => $externalPost['title'],
	'meta_input' => [
		'external_id' => $externalPost['id'],
		'key' => 'value'
	],
]

$args = [
	'post_title' => $externalPost['title'],
	'meta_input' => [
		'external_id' => $externalPost['id'],
	],
	'tax_input' => [
		'custom_taxonomy' => [16, 57],
	],
]

$args = [
	'post_title' => $externalPost['title'],
	'post_status' => fn (\Otomaties\WpSyncPosts\Post $post) => $post->id() ? 'publish' : 'draft', // publish if post exists, draft if it doesn't
	'meta_input' => [
		'external_id' => $externalPost['id'],
	],
]

$args = [
	'post_title' => $externalPost['title'],
	'meta_input' => [
		'external_id' => $externalPost['id'],
	],
	'lang'                          => $externalPost['language'],
	'wpml_reference'                => $externalPost['id'] . '_' . $externalPost['language'],
	'wpml_original_post_reference'  => $externalPost['id'] . '_' . 'en',
];

use \Otomaties\WpSyncPosts\Syncer;

$syncer = new Syncer('product');

foreach ($externalPosts as $externalPost) {
    $args = [
		'post_title' => $externalPost['title'],
		'media' => [
			[
				'key'           => false,
				'featured'      => true,
				'url'           => $externalPost['thumbnail']['url'], // String e.g. 'https://via.placeholder.com/800x600.png?text=Variation+4'
                'date_modified' => gmdate('Y-m-d H:i:s', $externalPost['thumbnail']['date_modified']),
			],
		],
		'meta_input' => [
			'external_id' => $externalPost['id'],
		],
		'tax_input' => [
			'product_cat' => [16, 57],
		],
		'woocommerce' => [
			'product_type' => $externalPost['product_type'], // string: 'variable', 'simple', ...
			'available_attributes' => $externalPost['available_attributes'], // Array of attributes e.g. ['color', 'size']
			'variations' => [], // Array of available variations
			'meta_input' => [
				'_sku' => $externalPost['sku'],
			],
		],
	];

	foreach($externalPost['variations'] as $variation) {
		$args['variations'] = [
			'woocommerce' => [
				'attributes' => [
					'color' => $variation['attributes']['color'], // string
					'size' => $variation['attributes']['size'], // string
				],
				'meta_input' => [
					'_regular_price' => $variation['price'], // float
					'_sku' => $variation['sku'], // string
					'_stock' => $variation['stockQuantity'], // int
					'_weight' => $variation['weight'], // float
					'_length' => $variation['length'], // float
					'_width' => $variation['width'], // float
					'_height' => $variation['height'], // float
					'_variation_description' => $variation['description'],
					'_backorders' => $variation['backorders'], // 'yes' or 'no'
				]
			],
			'media' => [
				[
					'key'           => false,
					'featured'      => true,
					'url'           => $variation['thumbnail']['url'], // String e.g. 'https://via.placeholder.com/800x600.png?text=Variation+4'
                	'date_modified' => gmdate('Y-m-d H:i:s', $variation['thumbnail']['date_modified']),
				],
			],
		];
	}

    $existingPostQuery = [
        'by'    => 'meta_value', // id, meta_value, sku
        'key'   => 'external_id', // Only if 'by' => 'meta_value'
        'value' => $externalPost['id'], // Unique value to identify this post
    ];

	$existingVariationQuery = [
		'by' => 'sku',
	];

    $syncer->addProduct($args, $existingPostQuery, $existingVariationQuery);
}

$syncer->execute();