Error when create connection to self for testing

I try to make new connection from HotelBookPro to HotelBookPro for testing purposes.
As a buyer I even don’t see HotelBookPro in sellers list. As a seller I can select HotelBookPro buyer but get error “No supplier code found” when click “Create connection”.

What are the best and simplest way making test requests to our system?

Hello @d.vakulenko , have you guys done the development of our Hotel Sellers API?

No, we are just strarting.

Hello @d.vakulenko ,

Our on-boarding team will contact you as soon as possible.

Kind regards,
Elisa Ripoll.