Is there a way to Update story point using the Request Javascript module?

[FYP Y369]

I am using ACE connect template.

The story point field for my jira project issues is customfield_10040 my updateIssue function does not update the customfield_10040. but if i modify to update summary it does update. When i click on the button no flags shows.

my json scopes is set to admin. Here is my code:

function updateIssue() {
    AP.request('/rest/api/3/issue/' + document.getElementById("issueKey").value, {
        type: "PUT",
        data: JSON.stringify({fields: {customfield_10040: document.getElementById("issueSummary").value}}
        ),
        contentType: "application/json",
        success: function (response) {
            AP.flag.create({title: 'Success', body: "Issue updated", type: 'success'});
        },

        error: function (response) {
            AP.flag.create({title: 'Error updating issue', body: response, type: 'error'});
        },
    });
}