results: Array
(
[member_ref] => 4667
[activity_id] =>
[activity_date] => 2019-01-01
[activity_type] => Subscription
[activity_description] => Subscription 2019
[activity_cost] => 0
[renewal_date] =>
[payment_date] => 2019-11-27
[payment_reference] => WP13633261118
[invoice_date] => 2018-12-18
[invoice_reference] => 5089
)