Importing lists as custom profile properties via API PUT request

Hi,

New user, currently integrating. I’m importing/maintaining customer profiles via API call - a PUT request to https://a.klaviyo.com/api//v1/person.

The payload is a standard array (this is PHP, btw, using curl, we have a custom ecommerce setup).

This works fine for built-in and custom properties as long as they are simple types, and also $consent seems to be fine just as an array too, ie:

$dataArr = array(    'api_key' => MY_PRIVATE_KEY,    'active' => 1,    'orphan' => 0,    '$city' => $cust->cust_del_town,    '$country' => $this->zone_countries_name_lookup[$cust->cust_del_country_id],    '$phone_number' => $cust->cust_del_telephone,    '$zip' => $cust->cust_del_postcode,    '$last_name' => $cust->cust_del_last_name,    '$first_name' => $cust->cust_del_first_name,    'last_name' => $cust->cust_del_last_name,    'first_name' => $cust->cust_del_first_name,    '$title' => $cust->cust_del_title,    'country_iso2' => $this->zone_countries_code_lookup[$cust->cust_del_country_id],    'is_uk' => ($cust->cust_del_country_id == UK_COUNTRY_ID ? 1 : 0),    'is_row' => ($cust->cust_del_country_id == UK_COUNTRY_ID ? 0 : 1),    'is_ml' => 0,    'hs_cust_id' => $cust->cust_id,    'hs_contact_type' => 'cust_table',    'hs_subscribed_date' => $cust->cust_reg_datetime,    'hs_no_of_orders' => $noOfOrders,    'hs_order_total_gbp' => $cust_lifetime_order_total,    'hs_last_ordered_datetime' => $most_recent_purchase_date,    'hs_marked_as_fraud' => $cust->fraud,    'hs_product_tags_purchased' => $this->listify($product_tags_purchased, 'str'),    'hs_brands_purchased' => $this->listify($brands_purchased, 'str'),    'hs_date_of_last_return' => $date_of_last_return,    'hs_returned_product_ids' => $this->listify($returned_product_ids, 'num'),    'hs_last_shoe_size_bought' => $last_shoe_size_bought,    'hs_last_non_shoe_size_bought' => $last_non_shoe_size_bought,    'updated' => date("Y-m-d H:i:s"),    '$consent' => array('email'));

...but hs_product_tags_purchased, hs_brands_purchased and hs_returned_product_ids don’t seem to be importing correctly as lists (the first 2 are lists of strings, the last one a list of integers.

I have tried sending them as native arrays, and also as json formatted strings (this is what $this->listify does, changes array(‘Herring’) into [“Herring”].

When I send as arrays, the value does not appear in the customer profile. When I try as a json formatted string ([“Herring”]) then the value appears in the customer profile as a string ‘[“Herring”]’ but cannot be searched using a ‘list contains’ query when creating a segment.

How do I import arrays as custom properties?

Many thanks,

Gareth