curl --request POST \
  --url https://prod-auth.tktchurch.com/oauth/end_session

import Foundation

let url = URL(string: "https://prod-auth.tktchurch.com/oauth/end_session")!
var request = URLRequest(url: url)
request.httpMethod = "POST"
request.timeoutInterval = 10

let (data, _) = try await URLSession.shared.data(for: request)
print(String(decoding: data, as: UTF8.self))

const options = {method: 'POST'};

fetch('https://prod-auth.tktchurch.com/oauth/end_session', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://prod-auth.tktchurch.com/oauth/end_session"

response = requests.post(url)

print(response.text)

{
  "error": "invalid_request",
  "error_description": "Redirect URI not registered for this client"
}