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Docs
History
Schema
Generate

Filter operations

Auth1

Backups1

Bank Accounts5

Bank Connections5

Categories5

Clients7

Companies2

Expense Categories5

Expenses8

Invoice Items (Products/Articles)6

Invoices19

Invoicing Settings2

Letters5

post/invoices/{invoiceId}/send-letterSend a PDF linked to an invoice
get/lettersList postal history
post/lettersSend any PDF by post
get/letters/{letterId}Read letter details and events
post/mh/pingen/webhookPingen lifecycle callback

Payment Methods5

Public2

Subscription1

Letters

Changes to Send a PDF linked to an invoice

post/invoices/{invoiceId}/send-letter

Sep 11, 2026f2a5ce43a2df Revision changes
- info
  endpoint added