results: Array
(
[member_ref] => 5619
[activity_id] =>
[activity_date] => 2021-01-01
[activity_type] => Subscription
[activity_description] => EASE 2021 membership subscription
[activity_cost] => 92
[renewal_date] => 2021-03-15
[payment_date] => 2021-03-15
[payment_reference] => WP14728916881
[invoice_date] =>
[invoice_reference] =>
)