The short answer
They are two optional PDF documents: one recording your request and one recording the transmission to the recipient's number. They cost €2.99 including VAT, billed solely when the fax has been delivered.
You can add them at the payment step, and the transmission receipt can be downloaded on the status page after delivery. See the pricing page.
What you receive
The request receipt notes that you asked for the fax to be sent, with the number and the time of the request. The transmission receipt notes the outcome of the call: the number reached, the date and time, and the number of pages sent.
Dates and times are expressed in Paris time and say so, so nobody has to guess the time zone.
When they are charged
Receipts cost €2.99 including VAT. They are charged only if the fax is successfully delivered; when the transmission fails, no receipt fee is owed.
The documents are meant as a record of the sending. For their weight as evidence, see the question on legal value.
Key points
- Two PDFs: request and transmission
- €2.99 including VAT, optional
- Charged only on successful delivery
- Dated in Paris time