Get records from zoho CRM (Invalid Request)

Hello guys, I have got the following response error when I try to post a request to the
https://www.zohoapis.eu/crm/v2/Subscriptions 400 (Bad Request)

{
"code": "INVALID_REQUEST",
"details": {},
"message": "unable to process your request. please verify whether you have entered proper method name, parameter and parameter values.",
"status": "error"
}
Error fetching data from Zoho CRM: Error: HTTP error! Status: 400 at fetchCRMData (widget.html?serviceOrigin=https%3A%2F%2Fdesk.zoho.eu&isDevMode=true&frameorigin=https%3A%2F%2Fdesk.zoho.eu:89:19)
async function fetchCRMData() {
const apiUrl = "https://www.zohoapis.eu/crm/v2/Subscriptions";
const authToken =
"1000.cf978fbc6002fa5c8b83477b0049ff13.b27c21736a57b74eabffa479acbb28e3"; // Replace with your Zoho OAuth token

const headers = {
Authorization: 'Zoho-oauthtoken ' + authToken,
};

try {
console.log("Fetching CRM data...");
const response = await fetch(apiUrl, {
method: "GET",
headers: headers,
throwHttpErrors : false,
'contentType': 'application/json'
});

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