Use Default IP in axios instead

I need help please.
So, in my react app, I have a function that’s making a request to an external API, The API server requires a stable IP making request to it, instead axios is sending the device’s IP, I tried setting the default IP with x-fawarded-for in the header, but It could not work. Can someone help me with how I can set the default requesting IP in axios?

const getBillerCategories = () => {

    const authorization = {
        "Accept": 'application/json',
        "Content-Type":  "application/json",
        "x-api-key": BAXI_API_KEY // this is the API Key
        "x-forwarded-for": "xxx.xx.x.xxx" // the required IP
    }

    return new Promise((resolve, reject) => {
        //console.log(authorization, 'n', ' chekced ', 'n');
        axios.get(BAXI_BASE_URL+'/billers/category/all', {headers: authorization}).then((response) => {
            resolve({status: true, data: response.data});
        }).catch((error) => {
            console.log(error.response.data, 'response data', BAXI_API_KEY);

            if(error.response){
                resolve({status: false, error: error.response.data.hasOwnProperty('message') ? error.response.data.message: error.response.data.toSting()});
            }else{
                resolve({status: false, error: error.message});
            }
        }); 
    });
   
}

Thank you in advance.