Mixam Print Link API Request

    // The fixed test payload
    $payload = [
        "publicationId" => "66b1e9ee6f1bbc067ba2834d",
        "copies" => 1,
        "metadata" => [
            "externalOrderId" => "ORDER-123456",
            "statusCallbackUrl" => "https://example.com/callback"
        ],
        "deliveryAddress" => [
            "company" => "Holmes Investigations",
            "firstName" => "Sherlock",
            "lastName" => "Holmes",
            "postcode" => "NW1 6XE",
            "line1" => "221B Baker Street",
            "line2" => "string",
            "line3" => "string",
            "town" => "London",
            "county" => "Marylebone",
            "country" => "GB",
            "phoneNumber" => "+44 1923 594 252",
            "emailAddress" => "[email protected]"
        ],
        "paymentMethod" => "TEST_ORDER"
    ];