Creation of notifications (and listing of same) returns an empty result set

[hurnell]

NotificationFilterUrlMonetaryAccountInternal::createWithListResponse returns an empty result set as does NotificationFilterUrlMonetaryAccountInternal::listing:
‌......
'notificationFilters' => NULL,
'notificationFiltersFieldForRequest' => NULL,

createWithListResponse does create the notification correctly but I cannot check if it has been made using sdk_php.

I am able to check using the direct api https://public-api.sandbox.bunq.com/v1/user/xxxxxx/monetary-account/xxxxxx/notification-filter-url or production equivalent.

Seems to get to Guzzle ok but the response is wrong!

Originally posted by @hurnell in https://github.com/bunq/sdk_php/issue_comments/691987880