Invoice statuses
Invoices in Atomia Billing API can have one of 6 statuses. Here is an explanation for each of them:
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New is initial status of the invoice. Can be considered is invoice draft since it is possible to edit it.
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Deleted defines that invoice is deleted.
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Sent defines that invoice is issued to a customer.
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Credited defines that invoice is credited and replaced by new (a.k.a. credit) invoice.
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Closed defines that invoice is fully paid.
 Open (obsoleted) defines that invoice is partially paid or over paid.
For more information you can always contact Atomia’s friendly support team.