Here's another answer from Justin, by the way:
"Good afternoon.
Olkhovsky Anton Andriyovich the person did not conclude an agreement with us, there is no account card in the card ...
The counterparty can only work on C2C.
What is "cod_transfer_type": 3? There is no such thing in the documentation.
An example of creating an EH in clause 11.6 Express waybill C2C Art. 68
https://justin.ua/api/api_justin_documentation.pdfEN was created incorrectly.