Return only files with the given purpose. Possible values:
additional_identity_documents and identity_documents - entity verification documents uploaded for payments onboarding.
attachments - supplementary attachments for accounts receivable invoices, quotes, and credit notes.
delivery_notes - auto-generated PDF versions of delivery notes.
einvoices_xml - e-invoice XML generated when sending e-invoices.
payables - payables (bills) received via email or uploaded via API.
receivable_signatures - images of customer signatures provided during quote acceptance.
receivables - auto-generated PDF versions of invoices, quotes, and credit notes.
zip - data export archives created by POST /data_exports.
Other values are unused.