How to send two objects using Axios put request to service

Question

I want to hit a service which looks like:

[HttpPut]
public void UpdateData(UserData parameter1, UserData parameter2)
{
//some code
}

To hit the service I am using Type Script and Axios (code is below) which I understand is wrong

async updateData(parameter1: UserData, parameter2: UserData): Promise<AxiosPromise<any>> {
        let res = null;
        res = await this.api.put("api/admin/Users/UpdateData/",{parameter1, parameter2 })
        return res.data;
    }

What should be the correct axios request to hit the service?

Note: UserData is a class