Mandate statuses and how they impact Direct Debit Collection are fully outlined here.
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Overview

Mandates can have various statuses, which are summarised below. Note that a number of additional statuses are possible (SCREENING, COMPLETE, etc.) but are not relevant to Nuapay users and can be ignored.

Status Description
PENDING The mandate has been created but the payer has not signed. Direct Debits cannot be created against the mandate.
READY_FOR_EXPORT Bacs-only status; the mandate has been created, the payer has signed but the mandate has not been exported to the AUDDIS service; Nuapay exports DDIs once per day
EXPORTED Bacs-only; the mandate has been passed to the AUDDIS service
ACTIVE The SEPA mandate has been signed and Direct Debits can be created against it or the DDI has reached Day 5 in the Bacs cycle, so payments may now be made against it.
CANCELLED The mandate is no longer active. Direct Debit payments cannot be made against a Cancelled mandate.
UNREADABLE If you are using our 3rd party paper mandate handling and a mandate is returned by your payer but cannot be clearly read then it is updated to a status of unreadable.
UNSIGNED This status is applied if you are using our 3rd party paper mandate handling service and a mandate is returned by your payer but has not been signed.
SUSPENDED The mandate is temporarily unusable. Unlike a cancelled mandate, a suspended mandate may be re-activated later if required. No Direct Debit payments may be created against a suspended mandate. Note that you cannot currently suspend a mandate via the API - this can only be managed via the Nuapay user interface.