Updating QB field with from an javacript request

Hi, 

I need to edit an existing field with a jwt token from an external system.
To do this I have created a javascript calling the AUTH process to request the jwt token.


My request code looks like this: 

$.ajax({
           type: 'POST',
           url: "https://api.endpoint.url";,
           processData: true,
           data: {login: "username, password: "password"},
           dataType: "JSON",
           success: function (data) {
               processData(data);
           }
});
 
function processData(data){

var token = (data.sessionData);
console.log (token)

}


How can I save the variable "token" to a field in QB.
I need to recurrently update the same field with the token string as the token expires.

Hope anyone can help


Best regards