Lob example

lob.php

<?php

/** @var \OpenAPI\Client\Configuration $config */
/** @var string $from_lob_address_id */
/** @var string $front */
/** @var string $back */

$editableAddress = new AddressEditable([
    'address_line1' => 'al. Jana Pawła II 21/37',
    'address_city' => 'Warszawa',
    'address_zip' => '00-854', // valid zip
    'address_state' => 'Mazowieckie', // state is optional in PL
    'address_country' => 'PL',
]);

$postcardsApi = new PostcardsApi($this->config);
$postcardEditable = new PostcardEditable([
    'from' => $from_lob_address_id, // required
    'to' => $addressEditable, // required
    'front' => $front, // required
    'back' => $back, // required
    'use_type' => \OpenAPI\Client\Model\CmpUseType::MARKETING->value, // required
]); 

$postcard = $postcardsApi->create($postcardEditable);