results: Array
(
[member_ref] => 4166
[activity_id] =>
[activity_date] => 2021-01-01
[activity_type] => Subscription
[activity_description] => Lancet Group subscription 2021
[activity_cost] => 2052
[renewal_date] =>
[payment_date] =>
[payment_reference] =>
[invoice_date] =>
[invoice_reference] =>
)