results: Array
(
[member_ref] => 5234
[activity_id] =>
[activity_date] => 2020-01-01
[activity_type] => Subscription
[activity_description] => Lancet group member subscription 2020
[activity_cost] => 0
[renewal_date] => 2019-12-11
[payment_date] => 2019-12-12
[payment_reference] => WP13661350674
[invoice_date] => 2019-12-12
[invoice_reference] => 5333
)