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post
/invoices/{invoiceId}/send-letter
Send a PDF linked to an invoice
get
/letters
List postal history
post
/letters
Send any PDF by post
get
/letters/{letterId}
Read letter details and events
post
/mh/pingen/webhook
Pingen lifecycle callback
Payment Methods
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Letters
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Changes to Read letter details and events
get
/letters/{letterId}
Sep 11, 2026
f2a5ce43a2df
Revision changes
info
endpoint added