I am getting error on delete issue

[Customer Portal]

Greetings,

I am using jira documentation for deleting issue https://developer.atlassian.com/cloud/jira/platform/rest/v3/api-group-issues/#api-rest-api-3-issue-issueidorkey-delete 

I am able to get issue details but not able to delete issue

Unirest\Response Object
(
    [code] => 415
    [raw_body] => 
    [body] => 
    [headers] => Array
        (
            [0] => HTTP/2 415
            [date] => Fri, 24 Jun 2022 15:06:04 GMT
            [content-type] => text/html;charset=UTF-8
            [server] => globaledge-envoy
            [timing-allow-origin] => *
            [x-arequestid] => 7498ef59-0b43-45f2-ba74-d8cb524b1478
            [set-cookie] => atlassian.xsrf.token=d7e796fd-9668-4d5f-8beb-8b60f6e44b1b_7226cb95b94a4abf7ad6260f4d525beef15f74ac_lin; path=/; SameSite=None; Secure
            [x-aaccountid] => 62b1e2fa0c77011bdfdc71e6
            [x-envoy-upstream-service-time] => 409
            [expect-ct] => report-uri="https://web-security-reports.services.atlassian.com/expect-ct-report/atlassian-proxy", max-age=86400
            [strict-transport-security] => max-age=63072000; preload
            [x-content-type-options] => nosniff
            [x-xss-protection] => 1; mode=block
            [atl-traceid] => 26ef0c4c05ced334
            [report-to] => {"group": "endpoint-1", "max_age": 600, "endpoints": [{"url": "https://dj9s4kmieytgz.cloudfront.net"}], "include_subdomains": true}
            [nel] => {"report_to": "endpoint-1", "max_age": 600, "include_subdomains": true, "failure_fraction": 0.001}
            [vary] => Accept-Encoding
            [content-encoding] => gzip
        )

)