Please provide RAW HTTP request and your company login.
Here is the raw request:
POST /admin/ HTTP/1.1
Accept: application/json, text/plain, /
Content-Type: application/json;charset=utf-8
X-Company-Login: nobiatest
X-User-Token:
User-Agent: axios/0.18.0
Content-Length: 164
Host: user-api.simplybook.me
Connection: close
{“jsonrpc”:“2.0”,“method”:“book”,“params”:[2,11,“315”,“2019-04-02”,“09:00”,“2019-04-02”,“11:00”,0,[{“2ff3898f52ce0577d4ad0755dd2c372b”:“My comments are here”}]],“id”:4}
I have solved this now. If I don’t enclose the additional fields in an array it works, i.e. {“2ff3898f52ce0577d4ad0755dd2c372b”:“My comments are here”} instead of [{“2ff3898f52ce0577d4ad0755dd2c372b”:“My comments are here”}]