How to set transport to peppol in createinvoice

in the documentation here : https://developer.b2brouter.net/docs/send_an_invoice_through_peppol_via_json_payload

there is the option to set the transport to peppol, that option is not present anymore in the api (client is repalced by contact but no transport option)

so how to set the transport to peppol directly from the createinvocie ?