def METHOD_NAME(channel_USD, channel_PLN):
    # given
    channel_usd_slug = channel_USD.slug
    channel_pln_slug = channel_PLN.slug
    channel_ids = [channel_USD.pk, channel_PLN.pk]
    export_info = {"channels": channel_ids}
    # when
    channel_headers = get_channels_headers(export_info)
    # then
    expected_headers = []
    for channel_slug in [channel_pln_slug, channel_usd_slug]:
        for field in [
            "product currency code",
            "published",
            "publication date",
            "published at",
            "searchable",
            "available for purchase",
            "price amount",
            "variant currency code",
            "variant cost price",
            "variant preorder quantity threshold",
        ]:
            expected_headers.append(f"{channel_slug} (channel {field})")
    assert channel_headers == expected_headers