Returns a paginated list of requirement instances. Supports filtering by status, type, payer, payee, engagement, definition, backing-resource sub-state, expiration state, and creation/expiry date ranges. The selected X-Wingspan-Account is the caller's own Payee account, or the Payer account when an explicit foreign payeeId review filter is supplied.

There is no payeeEngagementId != null idiom for separating active from archived requirements. Detaching a requirement from its last engagement sets its status to Inactive, so active is filter[status][notIn][]=Inactive and archived is filter[status][in][]=Inactive. Note that Inactive is a superset of "detached" — a cancelled monitor is Inactive while still attached to its engagement.