I have created a function, which can POST a webhook on Trello. The webhook is created succesfully, but I do not know how to store the json payload sent back by Trello, whenever the webhook is triggered. How do I get this data and potentially store it in my program?

function getApiData(url, restVar, name, bodyData) {
    console.log(`url:`, url);
    if (restVar === `GET`) {
        return new Promise((resolve, reject) => {
            console.log(`Get:`, name);
            fetch(`${url}`, {
                method: `${restVar}`,
                headers: {
                    'Content-Type': 'application/json'
                },
            })
                .then(response => response.json())
                .then(data => {
                    console.log('Success:', data);
                    resolve(data)
                })
                .catch((error) => {
                    console.error('Error:', error)
                    reject(error);
                })
        });
    }
    else if (restVar != `GET`) {
        return new Promise((resolve, reject) => {
            console.log(name)
            bodyData = JSON.stringify(bodyData);
            fetch(`${url}`, {
                method: `${restVar}`,
                headers: {
                    'Content-Type': 'application/json'
                },
                body: bodyData
            })
                .then(response => response.json())
                .then(data => {
                    console.log('Success:', data);
                    resolve(data)
                })
                .catch((error) => {
                    console.error('Error:', error)
                    reject(error);
                })
        });
    }
}

I am quite new to webhooks and web development in general. Any help is much appreciated. Have a great day! :D