Reply To: Add Customer to Coupon On The Fly

[Heidi Maskelyne]

I have sorted and fixed

$coupon_id= wc_get_coupon_id_by_code('example'); 	 
$add_coupon_id = array_merge(explode(',', get_post_meta($coupon_id, '_wjecf_customer_ids', true)), array($user_id));
update_post_meta($coupon_id, '_wjecf_customer_ids',implode(',', $add_coupon_id));

Thanks